Exploration of Mars
The planet Mars has been explored remotely by spacecraft. Probes sent from Earth, beginning in the late 20th century, have yielded a large increase in knowledge about the Martian system, focused primarily on understanding its geology and habitability potential. Engineering interplanetary journeys is complicated and the exploration of Mars has experienced a high failure rate, especially the early attempts. Roughly sixty percent of all spacecraft destined for Mars failed before completing their missions and some failed before their observations could begin. Some missions have met with unexpected success, such as the twin Mars Exploration Rovers, which operated for years beyond their specification.
- 1 Current status
- 2 Martian system
- 3 Launch windows
- 4 Past and current missions
- 4.1 Recent missions
- 4.2 Overview of missions
- 4.2.1 Early Soviet missions
- 4.2.2 Mariner program
- 4.2.3 Viking program
- 4.2.4 Mars Pathfinder
- 4.2.5 Mars Global Surveyor
- 4.2.6 Mars Odyssey and Mars Express
- 4.2.7 MER and Phoenix
- 4.2.8 Mars Reconnaissance Orbiter
- 4.2.9 Rosetta and Dawn swingbys
- 4.2.10 Fobos-Grunt
- 4.2.11 Curiosity rover
- 4.2.12 MAVEN
- 4.2.13 Mars Orbiter Mission
- 4.2.14 Trace Gas Orbiter and EDM
- 4.2.15 InSight and MarCO
- 5 Future missions
- 6 Human mission proposals
- 7 Probing difficulties
- 8 See also
- 9 References
- 10 Bibliography
- 11 External links
- 12 Notes
On June 10, 2018, Opportunity rover fell silent, leaving Curiosity of the Mars Science Laboratory mission with six orbiters surveying the planet: Mars Odyssey, Mars Express, Mars Reconnaissance Orbiter, Mars Orbiter Mission, MAVEN, and the Trace Gas Orbiter, which have contributed massive amounts of information about Mars. The stationary lander InSight is investigating the deep interior of Mars. No sample return missions have been attempted for Mars and an attempted return mission for Mars' moon Phobos (Fobos-Grunt) failed at launch in 2011.
Five more missions are in the late stages of development and fabrication, and will be launched between 2020 and 2021. These include the ExoMars Rosalind Franklin rover and landing platform Kazachok by Russia and ESA, NASA's Mars 2020 rover, the 2020 Chinese Mars Mission, the Hope Mars Mission by the United Arab Emirates, and India's Mars Orbiter Mission 2.
Mars has long been the subject of human interest. Early telescopic observations revealed color changes on the surface that were attributed to seasonal vegetation and apparent linear features were ascribed to intelligent design. Further telescopic observations found two moons, Phobos and Deimos, polar ice caps and the feature now known as Olympus Mons, the Solar System's second tallest mountain. The discoveries piqued further interest in the study and exploration of the red planet. Mars is a rocky planet, like Earth, that formed around the same time, yet with only half the diameter of Earth, and a far thinner atmosphere; it has a cold and desert-like surface.
The minimum-energy launch windows for a Martian expedition occur at intervals of approximately two years and two months (specifically 780 days, the planet's synodic period with respect to Earth). In addition, the lowest available transfer energy varies on a roughly 16-year cycle. For example, a minimum occurred in the 1969 and 1971 launch windows, rising to a peak in the late 1970s, and hitting another low in 1986 and 1988.
|Year||Launch||Spacecraft (launched or planned)|
|2013||Nov 2013||MAVEN, Mars Orbiter Mission|
|2016||Mar 2016||ExoMars TGO|
|2020||Jul 2020 – Sep 2020||Rosalind Franklin rover,|
Mars 2020 rover,
Mars Hope orbiter,
2020 Chinese Mars Mission
|2022||2022-2023||Mars Orbiter Mission 2 (MOM-2)|
Past and current missions
Starting in 1960, the Soviets launched a series of probes to Mars including the first intended flybys and hard (impact) landing (Mars 1962B). The first successful fly-by of Mars was on 14–15 July 1965, by NASA's Mariner 4. On November 14, 1971 Mariner 9 became the first space probe to orbit another planet when it entered into orbit around Mars. The amount of data returned by probes increased dramatically as technology improved.
The first to contact the surface were two Soviet probes: Mars 2 lander on November 27 and Mars 3 lander on December 2, 1971—Mars 2 failed during descent and Mars 3 about twenty seconds after the first Martian soft landing. Mars 6 failed during descent but did return some corrupted atmospheric data in 1974.  The 1975 NASA launches of the Viking program consisted of two orbiters, each with a lander that successfully soft landed in 1976. Viking 1 remained operational for six years, Viking 2 for three. The Viking landers relayed the first color panoramas of Mars.
The Soviet probes Phobos 1 and 2 were sent to Mars in 1988 to study Mars and its two moons, with a focus on Phobos. Phobos 1 lost contact on the way to Mars. Phobos 2, while successfully photographing Mars and Phobos, failed before it was set to release two landers to the surface of Phobos.
Mars has a reputation as a difficult space exploration target; just 25 of 55 missions through 2019, or 45.5%, have been fully successful, with a further three partially successful and partially failed. However, of the sixteen missions since 2001, twelve of those have been successful and eight of those are still operational.
Missions that ended prematurely after Phobos 1 and 2 (1988) include (see Probing difficulties section for more details):
- Mars Observer (launched in 1992)
- Mars 96 (1996)
- Mars Climate Orbiter (1999)
- Mars Polar Lander with Deep Space 2 (1999)
- Nozomi (2003)
- Beagle 2 (2003)
- Fobos-Grunt with Yinghuo-1 (2011)
- Schiaparelli lander (2016)
Following the 1993 failure of the Mars Observer orbiter, the NASA Mars Global Surveyor achieved Mars orbit in 1997. This mission was a complete success, having finished its primary mapping mission in early 2001. Contact was lost with the probe in November 2006 during its third extended program, spending exactly 10 operational years in space. The NASA Mars Pathfinder, carrying a robotic exploration vehicle Sojourner, landed in the Ares Vallis on Mars in the summer of 1997, returning many images.
Phoenix landed on the north polar region of Mars on May 25, 2008. Its robotic arm dug into the Martian soil and the presence of water ice was confirmed on June 20, 2008. The mission concluded on November 10, 2008 after contact was lost. In 2008, the price of transporting material from the surface of Earth to the surface of Mars was approximately US$309,000 per kilogram.
NASA's Mars Odyssey orbiter entered Mars orbit in 2001. Odyssey's Gamma Ray Spectrometer detected significant amounts of hydrogen in the upper metre or so of regolith on Mars. This hydrogen is thought to be contained in large deposits of water ice.
The Mars Express mission of the European Space Agency (ESA) reached Mars in 2003. It carried the Beagle 2 lander, which was not heard from after being released and was declared lost in February 2004. Beagle 2 was located in January 2015 by HiRise camera on NASA's Mars Reconnaissance Orbiter (MRO) having landed safely but failed to fully deploy its solar panels and antenna. In early 2004, the Mars Express Planetary Fourier Spectrometer team announced the orbiter had detected methane in the Martian atmosphere, a potential biosignature. ESA announced in June 2006 the discovery of aurorae on Mars by the Mars Express.
In January 2004, the NASA twin Mars Exploration Rovers named Spirit (MER-A) and Opportunity (MER-B) landed on the surface of Mars. Both have met and exceeded all their science objectives. Among the most significant scientific returns has been conclusive evidence that liquid water existed at some time in the past at both landing sites. Martian dust devils and windstorms have occasionally cleaned both rovers' solar panels, and thus increased their lifespan. Spirit rover (MER-A) was active until 2010, when it stopped sending data because it got stuck in a sand dune and was unable to reorient itself to recharge its batteries.
On 10 March 2006, NASA's Mars Reconnaissance Orbiter (MRO) probe arrived in orbit to conduct a two-year science survey. The orbiter began mapping the Martian terrain and weather to find suitable landing sites for upcoming lander missions. The MRO captured the first image of a series of active avalanches near the planet's north pole in 2008.
The Mars Science Laboratory mission was launched on November 26, 2011 and it delivered the Curiosity rover on the surface of Mars on August 6, 2012 UTC. It is larger and more advanced than the Mars Exploration Rovers, with a velocity of up to 90 meters per hour (295 feet per hour). Experiments include a laser chemical sampler that can deduce the composition of rocks at a distance of 7 meters.
MAVEN orbiter was launched on 18 November 2013, and on 22 September 2014 it was injected into an areocentric elliptic orbit 6,200 km (3,900 mi) by 150 km (93 mi) above the planet's surface to study its atmosphere. Mission goals include determining how the planet's atmosphere and water, presumed to have once been substantial, were lost over time.
The Indian Space Research Organisation (ISRO) launched their Mars Orbiter Mission (MOM) on November 5, 2013 and it was inserted into Mars orbit on 24 September 2014. India's ISRO is the fourth space agency to reach Mars, after the Soviet space program, NASA and ESA. India successfully placed a spacecraft into Mars orbit on its maiden attempt.
The ExoMars Trace Gas Orbiter arrived at Mars in 2016 and deployed the Schiaparelli EDM lander, a test lander. Schiaparelli crashed on surface, but it transmitted key data during its parachute descent, so the test was declared a partial success.
Overview of missions
Early Soviet missions
Between 1960 and 1969, the Soviet Union launched nine probes intended to reach Mars. They all failed: three at launch; three failed to reach near-Earth orbit; one during the burn to put the spacecraft into trans-Mars trajectory; and two during the interplanetary orbit.
The Mars 1M programs (sometimes dubbed Marsnik in Western media) was the first Soviet unmanned spacecraft interplanetary exploration program, which consisted of two flyby probes launched towards Mars in October 1960, Mars 1960A and Mars 1960B (also known as Korabl 4 and Korabl 5 respectively). After launch, the third stage pumps on both launchers were unable to develop enough pressure to commence ignition, so Earth parking orbit was not achieved. The spacecraft reached an altitude of 120 km before reentry.
Mars 1962A was a Mars fly-by mission, launched on October 24, 1962 and Mars 1962B an intended first Mars lander mission, launched in late December of the same year (1962). Both failed from either breaking up as they were going into Earth orbit or having the upper stage explode in orbit during the burn to put the spacecraft into trans-Mars trajectory.
The first success
|Spacecraft||Orbiter or flyby outcome||Lander outcome|
|Mars 3||Partial success||Partial success|
|Mars 5||Partial success||N/A|
|Phobos 1||Failure||Not deployed|
|Phobos 2||Partial success||Not deployed|
Mars 1 (1962 Beta Nu 1), an automatic interplanetary spacecraft launched to Mars on November 1, 1962, was the first probe of the Soviet Mars probe program to achieve interplanetary orbit. Mars 1 was intended to fly by the planet at a distance of about 11,000 km and take images of the surface as well as send back data on cosmic radiation, micrometeoroid impacts and Mars' magnetic field, radiation environment, atmospheric structure, and possible organic compounds. Sixty-one radio transmissions were held, initially at 2-day intervals and later at 5-day intervals, from which a large amount of interplanetary data was collected. On 21 March 1963, when the spacecraft was at a distance of 106,760,000 km from Earth, on its way to Mars, communications ceased due to failure of its antenna orientation system.
In 1964, both Soviet probe launches, of Zond 1964A on June 4, and Zond 2 on November 30, (part of the Zond program), resulted in failures. Zond 1964A had a failure at launch, while communication was lost with Zond 2 en route to Mars after a mid-course maneuver, in early May 1965.
In 1969, and as part of the Mars probe program, the Soviet Union prepared two identical 5-ton orbiters called M-69, dubbed by NASA as Mars 1969A and Mars 1969B. Both probes were lost in launch-related complications with the newly developed Proton rocket.
The USSR intended to have the first artificial satellite of Mars beating the planned American Mariner 8 and Mariner 9 Mars orbiters. In May 1971, one day after Mariner 8 malfunctioned at launch and failed to reach orbit, Cosmos 419 (Mars 1971C), a heavy probe of the Soviet Mars program M-71, also failed to launch. This spacecraft was designed as an orbiter only, while the next two probes of project M-71, Mars 2 and Mars 3, were multipurpose combinations of an orbiter and a lander with small skis-walking rovers that would be the first planet rovers outside the Moon. They were successfully launched in mid-May 1971 and reached Mars about seven months later. On November 27, 1971 the lander of Mars 2 crash-landed due to an on-board computer malfunction and became the first man-made object to reach the surface of Mars. On 2 December 1971, the Mars 3 lander became the first spacecraft to achieve a soft landing, but its transmission was interrupted after 14.5 seconds.
The Mars 2 and 3 orbiters sent back a relatively large volume of data covering the period from December 1971 to March 1972, although transmissions continued through to August. By 22 August 1972, after sending back data and a total of 60 pictures, Mars 2 and 3 concluded their missions. The images and data enabled creation of surface relief maps, and gave information on the Martian gravity and magnetic fields.
In 1973, the Soviet Union sent four more probes to Mars: the Mars 4 and Mars 5 orbiters and the Mars 6 and Mars 7 fly-by/lander combinations. All missions except Mars 7 sent back data, with Mars 5 being most successful. Mars 5 transmitted just 60 images before a loss of pressurization in the transmitter housing ended the mission. Mars 6 lander transmitted data during descent, but failed upon impact. Mars 4 flew by the planet at a range of 2200 km returning one swath of pictures and radio occultation data, which constituted the first detection of the nightside ionosphere on Mars. Mars 7 probe separated prematurely from the carrying vehicle due to a problem in the operation of one of the onboard systems (attitude control or retro-rockets) and missed the planet by 1,300 kilometres (8.7×10−6 au).
In 1964, NASA's Jet Propulsion Laboratory made two attempts at reaching Mars. Mariner 3 and Mariner 4 were identical spacecraft designed to carry out the first flybys of Mars. Mariner 3 was launched on November 5, 1964, but the shroud encasing the spacecraft atop its rocket failed to open properly, dooming the mission. Three weeks later, on November 28, 1964, Mariner 4 was launched successfully on a 7½-month voyage to Mars..
Mariner 4 flew past Mars on July 14, 1965, providing the first close-up photographs of another planet. The pictures, gradually played back to Earth from a small tape recorder on the probe, showed impact craters. It provided radically more accurate data about the planet; a surface atmospheric pressure of about 1% of Earth's and daytime temperatures of −100 °C (−148 °F) were estimated. No magnetic field or Martian radiation belts were detected. The new data meant redesigns for then planned Martian landers, and showed life would have a more difficult time surviving there than previously anticipated.
NASA continued the Mariner program with another pair of Mars flyby probes, Mariner 6 and 7. They were sent at the next launch window, and reached the planet in 1969. During the following launch window the Mariner program again suffered the loss of one of a pair of probes. Mariner 9 successfully entered orbit about Mars, the first spacecraft ever to do so, after the launch time failure of its sister ship, Mariner 8. When Mariner 9 reached Mars in 1971, it and two Soviet orbiters (Mars 2 and Mars 3, see Mars probe program above) found that a planet-wide dust storm was in progress. The mission controllers used the time spent waiting for the storm to clear to have the probe rendezvous with, and photograph, Phobos. When the storm cleared sufficiently for Mars' surface to be photographed by Mariner 9, the pictures returned represented a substantial advance over previous missions. These pictures were the first to offer more detailed evidence that liquid water might at one time have flowed on the planetary surface. They also finally discerned the true nature of many Martian albedo features. For example, Nix Olympica was one of only a few features that could be seen during the planetary duststorm, revealing it to be the highest mountain (volcano, to be exact) on any planet in the entire Solar System, and leading to its reclassification as Olympus Mons.
The Viking program launched Viking 1 and Viking 2 spacecraft to Mars in 1975; The program consisted of two orbiters and two landers – these were the first two spacecraft to successfully land and operate on Mars.
The primary scientific objectives of the lander mission were to search for biosignatures and observe meteorologic, seismic and magnetic properties of Mars. The results of the biological experiments on board the Viking landers remain inconclusive, with a reanalysis of the Viking data published in 2012 suggesting signs of microbial life on Mars.
The Viking orbiters revealed that large floods of water carved deep valleys, eroded grooves into bedrock, and traveled thousands of kilometers. Areas of branched streams, in the southern hemisphere, suggest that rain once fell.
Mars Pathfinder was a U.S. spacecraft that landed a base station with a roving probe on Mars on July 4, 1997. It consisted of a lander and a small 10.6 kilograms (23 lb) wheeled robotic rover named Sojourner, which was the first rover to operate on the surface of Mars. In addition to scientific objectives, the Mars Pathfinder mission was also a "proof-of-concept" for various technologies, such as an airbag landing system and automated obstacle avoidance, both later exploited by the Mars Exploration Rovers.
Mars Global Surveyor
After the 1992 failure of NASA's Mars Observer orbiter, NASA retooled and launched Mars Global Surveyor (MGS). Mars Global Surveyor launched on November 7, 1996, and entered orbit on September 12, 1997. After a year and a half trimming its orbit from a looping ellipse to a circular track around the planet, the spacecraft began its primary mapping mission in March 1999. It observed the planet from a low-altitude, nearly polar orbit over the course of one complete Martian year, the equivalent of nearly two Earth years. Mars Global Surveyor completed its primary mission on January 31, 2001, and completed several extended mission phases.
The mission studied the entire Martian surface, atmosphere, and interior, and returned more data about the red planet than all previous Mars missions combined. The data has been archived and remains available publicly.
Among key scientific findings, Global Surveyor took pictures of gullies and debris flow features that suggest there may be current sources of liquid water, similar to an aquifer, at or near the surface of the planet. Similar channels on Earth are formed by flowing water, but on Mars the temperature is normally too cold and the atmosphere too thin to sustain liquid water. Nevertheless, many scientists hypothesize that liquid groundwater can sometimes surface on Mars, erode gullies and channels, and pool at the bottom before freezing and evaporating.
Magnetometer readings showed that the planet's magnetic field is not globally generated in the planet's core, but is localized in particular areas of the crust. New temperature data and closeup images of the Martian moon Phobos showed that its surface is composed of powdery material at least 1 metre (3 feet) thick, caused by millions of years of meteoroid impacts. Data from the spacecraft's laser altimeter gave scientists their first 3-D views of Mars' north polar ice cap.
Faulty software uploaded to the vehicle in June 2006 caused the spacecraft to orient its solar panels incorrectly several months later, resulting in battery overheating and subsequent failure. On November 5, 2006 MGS lost contact with Earth. NASA ended efforts to restore communication on January 28, 2007.
Mars Odyssey and Mars Express
In 2001, NASA's Mars Odyssey orbiter arrived at Mars. Its mission is to use spectrometers and imagers to hunt for evidence of past or present water and volcanic activity on Mars. In 2002, it was announced that the probe's gamma-ray spectrometer and neutron spectrometer had detected large amounts of hydrogen, indicating that there are vast deposits of water ice in the upper three meters of Mars' soil within 60° latitude of the south pole.
On June 2, 2003, the European Space Agency's Mars Express set off from Baikonur Cosmodrome to Mars. The Mars Express craft consists of the Mars Express Orbiter and the stationary lander Beagle 2. The lander carried a digging device and the smallest mass spectrometer created to date, as well as a range of other devices, on a robotic arm in order to accurately analyze soil beneath the dusty surface to look for biosignatures and biomolecules.
The orbiter entered Mars orbit on December 25, 2003, and Beagle 2 entered Mars' atmosphere the same day. However, attempts to contact the lander failed. Communications attempts continued throughout January, but Beagle 2 was declared lost in mid-February, and a joint inquiry was launched by the UK and ESA. The Mars Express Orbiter confirmed the presence of water ice and carbon dioxide ice at the planet's south pole, while NASA had previously confirmed their presence at the north pole of Mars.
The lander's fate remained a mystery until it was located intact on the surface of Mars in a series of images from the Mars Reconnaissance Orbiter. The images suggest that two of the spacecraft's four solar panels failed to deploy, blocking the spacecraft's communications antenna. Beagle 2 is the first British and first European probe to achieve a soft landing on Mars.
MER and Phoenix
NASA's Mars Exploration Rover Mission (MER), started in 2003, was a robotic space mission involving two rovers, Spirit (MER-A) and Opportunity, (MER-B) that explored the Martian surface geology. The mission's scientific objective was to search for and characterize a wide range of rocks and soils that hold clues to past water activity on Mars. The mission was part of NASA's Mars Exploration Program, which includes three previous successful landers: the two Viking program landers in 1976; and Mars Pathfinder probe in 1997.
Mars Reconnaissance Orbiter
The Mars Reconnaissance Orbiter (MRO) is a multipurpose spacecraft designed to conduct reconnaissance and exploration of Mars from orbit. The US$720 million spacecraft was built by Lockheed Martin under the supervision of the Jet Propulsion Laboratory, launched August 12, 2005, and entered Mars orbit on March 10, 2006.
The MRO contains a host of scientific instruments such as the HiRISE camera, CTX camera, CRISM, and SHARAD. The HiRISE camera is used to analyze Martian landforms, whereas CRISM and SHARAD can detect water, ice, and minerals on and below the surface. Additionally, MRO is paving the way for upcoming generations of spacecraft through daily monitoring of Martian weather and surface conditions, searching for future landing sites, and testing a new telecommunications system that enable it to send and receive information at an unprecedented bitrate, compared to previous Mars spacecraft. Data transfer to and from the spacecraft occurs faster than all previous interplanetary missions combined and allows it to serve as an important relay satellite for other missions.
Rosetta and Dawn swingbys
The ESA Rosetta space probe mission to the comet 67P/Churyumov-Gerasimenko flew within 250 km of Mars on February 25, 2007, in a gravitational slingshot designed to slow and redirect the spacecraft.
On November 8, 2011, Russia's Roscosmos launched an ambitious mission called Fobos-Grunt. It consisted of a lander aimed to retrieve a sample back to Earth from Mars' moon Phobos, and place the Chinese Yinghuo-1 probe in Mars' orbit. The Fobos-Grunt mission suffered a complete control and communications failure shortly after launch and was left stranded in low Earth orbit, later falling back to Earth. The Yinghuo-1 satellite and Fobos-Grunt underwent destructive re-entry on January 15, 2012, finally disintegrating over the Pacific Ocean.
The NASA Mars Science Laboratory mission with its rover named Curiosity, was launched on November 26, 2011, and landed on Mars on August 6, 2012 on Aeolis Palus in Gale Crater. The rover carries instruments designed to look for past or present conditions relevant to the past or present habitability of Mars.
NASA's MAVEN is an orbiter mission to study the upper atmosphere of Mars. It will also serve as a communications relay satellite for robotic landers and rovers on the surface of Mars. MAVEN was launched 18 November 2013 and reached Mars on 22 September 2014.
Mars Orbiter Mission
The Mars Orbiter Mission, also called Mangalyaan, was launched on 5 November 2013 by the Indian Space Research Organisation (ISRO). It was successfully inserted into Martian orbit on 24 September 2014. The mission is a technology demonstrator, and as secondary objective, it will also study the Martian atmosphere. This is India's first mission to Mars, and with it, ISRO became the fourth space agency to successfully reach Mars after the Soviet Union, NASA (USA) and ESA (Europe). It also made ISRO the second space agency to reach Mars orbit on its first attempt (the first national one, after the international ESA), and also the first Asian country to successfully send an orbiter to Mars. It was completed in a record low budget of $71 million, making it the least-expensive Mars mission to date.
Trace Gas Orbiter and EDM
The ExoMars Trace Gas Orbiter is an atmospheric research orbiter built in collaboration between ESA and Roscosmos. It was injected into Mars orbit on 19 October 2016 to gain a better understanding of methane (CH
4) and other trace gases present in the Martian atmosphere that could be evidence for possible biological or geological activity. The Schiaparelli EDM lander was destroyed when trying to land on the surface of Mars.
InSight and MarCO
In August 2012, NASA selected InSight, a $425 million lander mission with a heat flow probe and seismometer, to determine the deep interior structure of Mars. Two flyby CubeSats called MarCO were launched with InSight on 5 May 2018 to provide real-time telemetry during the entry and landing of InSight. The CubeSats separated from the Atlas V booster 1.5 hours after launch and traveled their own trajectories to Mars. InSight landed successfully on Mars on 26 November 2018.
- As part of the ExoMars program, ESA and the Russian Federal Space Agency plan to send the Rosalind Franklin rover in 2020 to search for evidence of past or present microscopic life on Mars. The lander to deliver the rover is called Kazachok, and it will perform scientific studies for about 2 years.
- The Mars 2020 rover mission by NASA will be launched in 2020, and it is based on the Mars Science Laboratory design. The scientific payload will be focused on astrobiology. It will include a miniature robotic Mars Helicopter Scout.
- The 2020 Chinese Mars Mission is planned to comprise an orbiter, a lander and a small rover.
- The United Arab Emirates will send an orbiter to Mars, the Hope Mars Mission, in 2020. It will be focused on the atmosphere and weather.
- India's ISRO plans to send a follow-up mission to its Mars Orbiter Mission in 2024; it is called Mars Orbiter Mission 2 (MOM-2) and it will consist of an orbiter, and probably a rover.
- The Finnish-Russian Mars MetNet concept would use multiple small meteorological stations on Mars to establish a widespread observation network to investigate the planet's atmospheric structure, physics and meteorology. The MetNet precursor or demonstrator was considered for a piggyback launch on Fobos-Grunt, and on the two proposed to fly on the 2016 and 2020 ExoMars spacecraft.
- The Mars-Grunt is a Russian mission concept to bring a sample of Martian soil to Earth.
- A ESA-NASA team produced a three-launch architecture concept for a Mars sample return, which uses a rover to cache small samples, a Mars ascent stage to send it into orbit, and an orbiter to rendezvous with it above Mars and take it to Earth. Solar-electric propulsion could allow a one launch sample return instead of three.
- The Mars Scout Program's SCIM would involve a probe grazing the upper atmosphere of Mars to collect dust and air for return to Earth.
- JAXA is working on a mission concept called MELOS rover that would look for biosignatures of extant life on Mars.
Other future mission concepts include polar probes, Martian aircraft and a network of small meteorological stations. Longterm areas of study may include Martian lava tubes, resource utilization, and electronic charge carriers in rocks. Micromissions are another possibility, such as piggybacking a small spacecraft on an Ariane 5 rocket and using a lunar gravity assist to get to Mars.
Human mission proposals
The human exploration of Mars has been an aspiration since the earliest days of modern rocketry; Robert H. Goddard credits the idea of reaching Mars as his own inspiration to study the physics and engineering of space flight. Proposals for human exploration of Mars have been made throughout the history of space exploration; currently there are multiple active plans and programs to put humans on Mars within the next ten to thirty years, both governmental and private, some of which are listed below.
Human exploration by the United States was identified as a long-term goal in the Vision for Space Exploration announced in 2004 by then US President George W. Bush. The planned Orion spacecraft would be used to send a human expedition to Earth's moon by 2020 as a stepping stone to a Mars expedition. On September 28, 2007, NASA administrator Michael D. Griffin stated that NASA aims to put a person on Mars by 2037.
On December 2, 2014, NASA's Advanced Human Exploration Systems and Operations Mission Director Jason Crusan and Deputy Associate Administrator for Programs James Reuthner announced tentative support for the Boeing "Affordable Mars Mission Design" including radiation shielding, centrifugal artificial gravity, in-transit consumable resupply, and a lander which can return. Reuthner suggested that if adequate funding was forthcoming, the proposed mission would be expected in the early 2030s.
On October 8, 2015, NASA published its official plan for human exploration and colonization of Mars. They called it "Journey to Mars". The plan operates through three distinct phases leading up to fully sustained colonization.
- The first stage, already underway, is the "Earth Reliant" phase. This phase continues utilizing the International Space Station until 2024; validating deep space technologies and studying the effects of long duration space missions on the human body.
- The second stage, "Proving Ground," moves away from Earth reliance and ventures into cislunar space for most of its tasks. This is when NASA plans to capture an asteroid (planned for 2020), test deep space habitation facilities, and validate capabilities required for human exploration of Mars. Finally, phase three is the transition to independence from Earth resources.
- The last stage, the "Earth Independent" phase, includes long term missions on the lunar surface which leverage surface habitats that only require routine maintenance, and the harvesting of Martian resources for fuel, water, and building materials. NASA is still aiming for human missions to Mars in the 2030s, though Earth independence could take decades longer.
On August 28, 2015, NASA funded a year long simulation to study the effects of a year long Mars mission on six scientists. The scientists lived in a bio dome on a Mauna Loa mountain in Hawaii with limited connection to the outside world and were only allowed outside if they were wearing spacesuits.
NASAs human Mars exploration plans have evolved through the NASA Mars Design Reference Missions, a series of design studies for human exploration of Mars.
In 2017 the focus of NASA shifted to a return to the Moon by 2024 with the Artemis program, a flight to Mars could follow after this project.
The long-term goal of the private corporation SpaceX is the establishment of routine flights to Mars to enable colonization. To this end, the company is developing Starship, a spacecraft capable of crew transportation to Mars and other celestial bodies, along with its booster Super Heavy. In 2017 SpaceX announced plans to send two uncrewed Starships to Mars by 2022, followed by two more uncrewed flights and two crewed flights in 2024. Starship is planned to have a payload of at least 100 tonnes. Starship is designed to use a combination of aerobraking and propulsive descent, utilizing fuel produced from a Mars (in situ resource utilization) facility. As of mid-September 2019, the Starship development program has seen successful testing of a test bed (Starhopper), with an orbital prototype (Starship Mk3) under construction in Boca Chica, Texas, as of December 2019. Launch Complex 39A at Kennedy Space Center will have a dedicated launch pad, fuelling and supporting facilities added for Starship missions.
Mars Direct, a low-cost human mission proposed by Robert Zubrin, founder of the Mars Society, would use heavy-lift Saturn V class rockets, such as the Ares V, to skip orbital construction, LEO rendezvous, and lunar fuel depots. A modified proposal, called "Mars to Stay", involves not returning the first immigrant explorers immediately, if ever (see Colonization of Mars). 
|Phobos 2||Partial success|
|Mars Global Surveyor||Success|
|Mars Climate Orbiter||Failure|
|Mars Polar Lander||Failure|
|Deep Space 2||Failure|
The challenge, complexity and length of Mars missions have led to many mission failures. The high failure rate of missions launched from Earth attempting to explore Mars is informally called the "Mars Curse" or "Martian Curse". The phrase "Galactic Ghoul" or "Great Galactic Ghoul", referring to a fictitious space monster that subsists on a diet of Mars probes, was coined in 1997 by Time Magazine journalist Donald Neff, and is sometimes facetiously used to "explain" the recurring difficulties.
Two Soviet probes were sent to Mars in 1988 as part of the Phobos program. Phobos 1 operated normally until an expected communications session on 2 September 1988 failed to occur. The problem was traced to a software error, which deactivated attitude thrusters causing the spacecrafts' solar arrays to no longer point at the Sun, depleting Phobos 1 batteries. Phobos 2 operated normally throughout its cruise and Mars orbital insertion phases on January 29, 1989, gathering data on the Sun, interplanetary medium, Mars, and Phobos. Shortly before the final phase of the mission – during which the spacecraft was to approach within 50 m of Phobos' surface and release two landers, one a mobile 'hopper', the other a stationary platform – contact with Phobos 2 was lost. The mission ended when the spacecraft signal failed to be successfully reacquired on March 27, 1989. The cause of the failure was determined to be a malfunction of the on-board computer.
Just a few years later in 1992 Mars Observer, launched by NASA, failed as it approached Mars. Mars 96, an orbiter launched on November 16, 1996 by Russia failed, when the planned second burn of the Block D-2 fourth stage did not occur.
Following the success of Global Surveyor and Pathfinder, another spate of failures occurred in 1998 and 1999, with the Japanese Nozomi orbiter and NASA's Mars Climate Orbiter, Mars Polar Lander, and Deep Space 2 penetrators all suffering various fatal errors. The Mars Climate Orbiter was noted for mixing up U.S. customary units with metric units, causing the orbiter to burn up while entering Mars' atmosphere.
The European Space Agency has also attempted to land two probes on the Martian surface; Beagle 2, a British-built lander that failed to deploy its solar arrays properly after touchdown in December 2003, and Schiaparelli, which was flown along the ExoMars Trace Gas Orbiter. Contact with the Schiaparelli EDM lander was lost 50 seconds before touchdown. It was later confirmed that the lander struck the surface at a high velocity, possibly exploding.
- Grotzinger, John P. (24 January 2014). "Introduction to Special Issue – Habitability, Taphonomy and the Search for Organic Carbon on Mars". Science. 343 (6169): 386–387. Bibcode:2014Sci...343..386G. doi:10.1126/science.1249944. PMID 24458635.
- Society, National Geographic (2009-10-15). "Mars Exploration, Mars Rovers Information, Facts, News, Photos – National Geographic". National Geographic. Retrieved 2016-03-04.
- "A Brief History of Mars Missions | Mars Exploration". Space.com. Retrieved 2016-03-04.
- Sheehan, William (1996). "The Planet Mars: A History of Observation and Discovery". The University of Arizona Press, Tucson. Retrieved 2009-02-15.
- Morton, Oliver (2002). Mapping Mars: Science, Imagination, and the Birth of a World. New York: Picador USA. p. 98. ISBN 0-312-24551-3.
- "Online Atlas of Mars". Ralphaeschliman.com. Retrieved December 16, 2012.
- "Online Atlas of Mars". Ralphaeschliman.com. Retrieved December 16, 2012.
- "PIA03467: The MGS MOC Wide Angle Map of Mars". Photojournal. NASA / Jet Propulsion Laboratory. February 16, 2002. Retrieved December 16, 2012.
- David S. F. Portree, Humans to Mars: Fifty Years of Mission Planning, 1950–2000, NASA Monographs in Aerospace History Series, Number 21, February 2001. Available as NASA SP-2001-4521.
- "D. McCleese, et al. – Robotic Mars Exploration Strategy" (PDF). nasa.gov. Retrieved 9 February 2017.
- Haider, Syed A.; et al. (2018). "Indian Mars and Venus Missions: Science and Exploration" (PDF). Scientific Assembly Abstracts. 42rd Committee on Space Research Scientific Assembly. 14–22 July 2018. Pasadena, California. p. 432. B4.1-0010-18.
- NASA PROGRAM & MISSIONS Historical Log. Mars.jpl.nasa.gov. Retrieved on 2012-08-14.
- "Mariner 4". NSSDC Master Catalog. NASA. Retrieved 2009-02-11.
- "Mariner 9: Overview". NASA. Archived from the original on 2012-07-31.
- Mars 2 Lander – NASA. Nssdc.gsfc.nasa.gov. Retrieved on 2012-05-10.
- Mars 6 – NASA. Nssdc.gsfc.nasa.gov. Retrieved on 2012-05-10.
- "Other Mars Missions". Journey through the galaxy. Archived from the original on 2006-09-20. Retrieved 2006-06-13.
- Sagdeev, R. Z.; Zakharov, A. V. (October 19, 1989). "Brief history of the Phobos mission". Nature. 341 (6243): 581–585. Bibcode:1989Natur.341..581S. doi:10.1038/341581a0.
- "Mars Global Surveyor". CNN- Destination Mars. Archived from the original on 2006-04-15. Retrieved 2006-06-13.
- "Mars Pulls Phoenix In". University of Arizona Phoenix mission Website. Archived from the original on 2008-05-27. Retrieved 2008-05-25.
- "Phoenix: The Search for Water". NASA website. Retrieved 2007-03-03.
- "Frozen Water Confirmed on Mars". UANews.org. Retrieved 2008-08-24.
- Amos, Jonathan (November 10, 2008). "NASA Mars Mission declared dead". BBC. Retrieved 2008-11-10.
- Mitchell, Cary L.; Purdue University. "Living in Space". The Universe. Season 2008–09. Episode 307.
- Space probe performs Mars fly-by. BBC News (2007-02-25). Retrieved on 2012-08-14.
- Agle, D. C. (February 12, 2009). "NASA Spacecraft Falling For Mars". NASA/JPL. Retrieved 2009-12-27.
- "NASA's Mars Odyssey Shifting Orbit for Extended Mission". NASA. October 9, 2008. Retrieved 2008-11-15.
- Britt, Robert (March 14, 2003). "Odyssey Spacecraft Generates New Mars Mysteries". Space.com. Archived from the original on 2006-03-15. Retrieved 2006-06-13.
- Pearson, Michael (16 January 2015). "UK's Beagle 2 lander spotted on Mars". CNN. Retrieved 2015-01-17.
- ESA Media Relations Division (February 11, 2004). "UK and ESA announce Beagle 2 inquiry". ESA News. Retrieved 2011-04-28.
- Bertaux, Jean-Loup; et al. (June 9, 2005). "Discovery of an aurora on Mars". Nature. 435 (7043): 790–4. Bibcode:2005Natur.435..790B. doi:10.1038/nature03603. PMID 15944698.
- "Mars Exploration Rovers- Science". MER website. NASA. Retrieved 2006-06-13.
- "Photo shows avalanche on Mars". CNN. Archived from the original on April 19, 2008. Retrieved 2008-03-04.
- "Mars Science Laboratory — Homepage". NASA. Archived from the original on 2009-07-30. Retrieved 2012-08-25.
- "Chemistry and Cam (ChemCam)". NASA.
- Brown, Dwayne; Neal-Jones, Nancy; Zubritsky, Elizabeth (September 21, 2014). "NASA's Newest Mars Mission Spacecraft Enters Orbit around Red Planet". NASA. Retrieved September 22, 2014.
- Majumder, Sanjoy (5 November 2013). "India launches spacecraft to Mars". BBC News. Retrieved 2014-01-26.
If the satellite orbits the Red Planet, India's space agency is the fourth in the world after those of the US, Russia and Europe to undertake a successful Mars mission
- "Isro's Mars mission successful, India makes history". Retrieved 13 December 2014.
- "ExoMars TGO reaches Mars orbit while EDM situation under assessment". ESA press release. 19 October 2016. Archived from the original on 20 October 2016. Retrieved 19 October 2016.
- Robbins, Stuart (2008). ""Journey Through the Galaxy" Mars Program: Mars ~ 1960–1974". SJR Design. Retrieved 2014-01-26.
- Mihos, Chris (11 January 2006). "Mars (1960–1974): Mars 1". Department of Astronomy, Case Western Reserve University. Archived from the original on 2013-10-13. Retrieved 2014-01-26.
- "NASA A Chronology of Mars Exploration". Retrieved 2007-03-28.
- Perminov, V.G. (July 1999). The Difficult Road to Mars – A Brief History of Mars Exploration in the Soviet Union (PDF). NASA Headquarters History Division. p. 58. ISBN 978-0-16-058859-4.
- "NASA (NSSDC) Master Catalog Display Mars 3". Retrieved 2007-03-28.
- "NASA (NSSDC) Master Catalog Display Mars 4". Retrieved 2007-03-28.
- O'Gallagher, J.J.; Simpson, J.A. (September 10, 1965). "Search for Trapped Electrons and a Magnetic Moment at Mars by Mariner IV". Science. New Series. 149 (3689): 1233–1239. Bibcode:1965Sci...149.1233O. doi:10.1126/science.149.3689.1233. PMID 17747452.
- Smith, Edward J.; Davis, L.; Coleman, Paul; Jones, Douglas (September 10, 1965). "Magnetic Field Measurements Near Mars". Science. New Series. 149 (3689): 1241–1242. Bibcode:1965Sci...149.1241S. doi:10.1126/science.149.3689.1241. PMID 17747454.
- Van Allen, J.A.; Frank, L.A.; Krimigis, S.M.; Hills, H.K. (September 10, 1965). "Absence of Martian Radiation Belts and Implications Thereof". Science. New Series. 149 (3689): 1228–1233. Bibcode:1965Sci...149.1228V. doi:10.1126/science.149.3689.1228. hdl:2060/19650024318. PMID 17747451.
- Leighton, Robert B.; Murray, Bruce C.; Sharp, Robert P.; Allen, J. Denton; Sloan, Richard K. (August 6, 1965). "Mariner IV Photography of Mars: Initial Results". Science. New Series. 149 (3684): 627–630. Bibcode:1965Sci...149..627L. doi:10.1126/science.149.3684.627. PMID 17747569.
- Kliore, Arvydas; Cain, Dan L.; Levy, Gerald S.; Eshleman, Von R.; Fjeldbo, Gunnar; Drake, Frank D. (September 10, 1965). "Occultation Experiment: Results of the First Direct Measurement of Mars's Atmosphere and Ionosphere". Science. New Series. 149 (3689): 1243–1248. Bibcode:1965Sci...149.1243K. doi:10.1126/science.149.3689.1243. PMID 17747455.
- Salisbury, Frank B. (April 6, 1962). "Martian Biology". Science. New Series. 136 (3510): 17–26. Bibcode:1962Sci...136...17S. doi:10.1126/science.136.3510.17. PMID 17779780.
- Kilston, Steven D.; Drummond, Robert R.; Sagan, Carl (1966). "A Search for Life on Earth at Kilometer Resolution". Icarus. 5 (1–6): 79–98. Bibcode:1966Icar....5...79K. doi:10.1016/0019-1035(66)90010-8.
- Bianciardi, Giorgio; Miller, Joseph D.; Straat, Patricia Ann; Levin, Gilbert V. (March 2012). "Complexity Analysis of the Viking Labeled Release Experiments". IJASS. 13 (1): 14–26. Bibcode:2012IJASS..13...14B. doi:10.5139/IJASS.2012.13.1.14. Archived from the original on 2012-04-15. Retrieved 2012-04-15.
- Klotz, Irene (12 April 2012). "Mars Viking Robots 'Found Life'". DiscoveryNews. Retrieved 2012-04-16.
- Matthews, Mildred S. (1 October 1992). Mars. University of Arizona Press. ISBN 978-0-8165-1257-7. Retrieved 14 August 2012.
- Raeburn, P. (1998) "Uncovering the Secrets of the Red Planet Mars". National Geographic Society. Washington D.C. ISBN 0792273737.
- Moore, Patrick; Hunt, Garry (1 January 1997). The Atlas of the Solar System. Chancellor Press. ISBN 978-0-7537-0014-3. Retrieved 2012-08-14.
- Anderson, Charlene (August 1990). "The First Rover on Mars – The Soviets Did It in 1971". The Planetary Report. Archived from the original on 2011-06-05. Retrieved 2012-04-05.
- December 4, 1996 – First successful Mars Rover – Sojourner – was launched. Todayinspacehistory.wordpress.com (2007-12-04). Retrieved on 2012-08-14.
- "PDS Geosciences Node Data and Services: MGS". Retrieved 2006-08-27.
- Minkel, JR. "Human Error Caused Mars Global Surveyor Failure". Retrieved 2018-11-27.
- David, Leonard. "Mars Global Surveyor Remains Silent, Feared Lost". Retrieved 2007-04-01.
- Mars Global Surveyor Operations Review Board. "Mars Global Surveyor (MGS) Spacecraft Loss of Contact" (PDF). Retrieved 2012-02-15.
- Webster, Guy (16 January 2015). "'Lost' 2003 Mars Lander Found by Mars Reconnaissance Orbiter". NASA. Retrieved 16 January 2015.
- "Mars Orbiter Spots Beagle 2, European Lander Missing Since 2003". The New York Times. Associated Press. 16 January 2015. Retrieved 2015-01-17.
- "Catalog Page for PIA22240".
- ""Spaceflight Now" MRO Mission Status Center". Retrieved 23 October 2016.
- "Europe set for billion-euro gamble with comet-chasing probe". PhysOrg.com. 2007-02-23. Archived from the original on 2007-02-25.
- Malik, Tariq (February 18, 2009). "Asteroid-Bound Probe Zooms Past Mars". Space.com. Retrieved 2015-08-20.
- "Russia's failed Phobos-Grunt space probe heads to Earth", BBC News (2012-01-14).
- "Phobos-Grunt: Failed Russian Mars Probe Falls to Earth". ABC News, January 15, 2012.
- "Phobos-Grunt: Failed probe likely to return late Sunday". BBC News (2012-01-15).
- Morris Jones (2011-11-17). "Yinghuo Was Worth It". Space Daily. Retrieved 19 November 2011.
- "Mars Science Laboratory Launch". 26 November 2011. Retrieved 2011-11-26.
- Associated Press (26 November 2011). "NASA Launches Super-Size Rover to Mars: 'Go, Go!'". The New York Times. Retrieved 2011-11-26.
- USGS (16 May 2012). "Three New Names Approved for Features on Mars". USGS. Archived from the original on 28 July 2012. Retrieved 28 May 2012.
- "'Mount Sharp' on Mars Compared to Three Big Mountains on Earth". NASA. 27 March 2012. Retrieved 31 March 2012.
- Agle, D. C. (28 March 2012). "'Mount Sharp' On Mars Links Geology's Past and Future". NASA. Retrieved 31 March 2012.
- "NASA's New Mars Rover Will Explore Towering 'Mount Sharp'". Space.com. 29 March 2012. Retrieved 30 March 2012.
- "NASA Selects 'MAVEN' Mission to Study Mars Atmosphere". Nasa. Retrieved 2009-09-20.
- "Mars Atmosphere and Volatile Evolution mission – MAVEN". NASA. 2015-02-24. Retrieved 12 June 2015.
- "India Successfully Launches First Mission to Mars; PM Congratulates ISRO Team". International Business Times. 5 November 2013. Retrieved 13 October 2014.
- Bhatt, Abhinav (5 November 2013). "India's 450-crore mission to Mars to begin today: 10 facts". NDTV. Retrieved 13 October 2014.
- Vij, Shivam (5 November 2013). "India's Mars mission: worth the cost?". Christian Science Monitor. Retrieved 13 October 2014.
- Chang, Kenneth (19 October 2016). "ExoMars Mission to Join Crowd of Spacecraft at Mars". The New York Times. Retrieved 19 October 2016.
- NASA will send robot drill to Mars in 2016, Washington Post, By Brian Vastag, Monday, August 20
- Concepts and Approaches for Mars Exploration – LPI – USRA (2012). Lpi.usra.edu. Retrieved on 2012-05-10.
- "InSight: Mission". Mission Website. NASA's Jet Propulsion Laboratory. Retrieved 7 December 2011.
- Chang, Kenneth (5 May 2018). "NASA's Mars InSight Mission Launches for Six-Month Journey". The New York Times. Retrieved 7 May 2018.
- "NASA Prepares for First Interplanetary CubeSat Mission". 2015-06-12. Retrieved 2015-06-12.
- "The CubeSat Era in Space". Retrieved 2015-08-20.
- "InSight". 2015-02-23. Retrieved 2015-06-12.
- Chang, Kenneth (26 November 2018). "Mars InSight Landing: Follow NASA's Return to the Red Planet - The NASA spacecraft will arrive at the red planet today and attempt to reach its surface in one piece". The New York Times. Retrieved 26 November 2018.
- "Money Troubles May Delay Europe-Russia Mars Mission". Agence France-Presse. Industry Week. 15 January 2016. Retrieved 2016-01-16.
- NASA Announces Mars 2020 Rover Payload to Explore the Red Planet as Never Before. July 31, 2014.
- "China unveils its Mars rover after India's successful 'Mangalyaan'". The Times of India. 2014-11-10. Retrieved 2017-03-23.
- UAE to explore Mars' atmosphere with probe named 'Hope'. Adam Schreck, Excite News 0 May 2015.
- Tharoor, Ishaan 2014/16/07. "U.A.E. plans Arab world's first mission to Mars".
- Jatiya, Satyanarayan (18 July 2019). "Rajya Sabha Unstarred Question No. 2955" (PDF). Archived from the original on 30 August 2019. Retrieved 30 August 2019.
- "India eyes a return to Mars and a first run at Venus". Science. 17 February 2017. Retrieved 1 May 2017.
- Harri, A. M.; Schmidt, W.; H., Guerrero; Vasquez, L. (2012). "Future Plans for MetNet Lander Mars Missions" (PDF). Geophysical Research Abstracts. 14 (EGU2012–8224): 8224. Bibcode:2012EGUGA..14.8224H. Retrieved 18 February 2014.
- "The MetNet Mars Precursor Mission". Finnish Meteorological Institute. Retrieved 2008-08-28.
- Day, Dwayne A. (2011-11-28). "Red Planet blues". The Space Review. Retrieved 2012-01-16.
- Planetary Science Decadal Survey Mission & Technology Studies. Sites.nationalacademies.org. Retrieved on 2012-05-10.
- Oh, David Y. et al. (2009) Single Launch Architecture for Potential Mars Sample Return Mission Using Electric Propulsion. JPL/Caltech.
- Jones, S.M. et al. Mars Sample Return at 6 Kilometers per Second: Practical, Low Cost, Low Risk, and Ready. Ground Truth from Mars: Science Payoff from a Sample Return Mission, held April 21–23, 2008, in Albuquerque, New Mexico. LPI Contribution No. 1401, pp. 39–40.
- Miyamoto, Hirdy (ed.). Current plan of the MELOS, a proposed Japanese Mars mission (PDF). MEPAG meeting 2015.
- Decadal Survey Document Listing: White Papers Archived 2013-05-14 at the Wayback Machine (NASA)
- Balloons – NASA. Mars.jpl.nasa.gov. Retrieved on 2012-05-10.
- Oliver Morton – '''MarsAir''' (January 2000) – Air & Space magazine. Airspacemag.com. Retrieved on 2012-08-14.
- Stern, David. "Robert Goddard and His Rockets". NASA Goddard Space Flight Center. Retrieved 21 November 2019.
- Britt, Robert. "When do we get to Mars?". Space.com FAQ: Bush's New Space Vision. Archived from the original on 2006-02-09. Retrieved 2006-06-13.
- "NASA aims to put man on Mars by 2037". AFP.
- K.Klaus, M. L. Raftery and K. E. Post (2014) "An Affordable Mars Mission Design" Archived 2015-05-07 at the Wayback Machine (Houston, Texas: Boeing Co.)
- M. L. Raftery (May 14, 2014) "Mission to Mars in Six (not so easy) Pieces" (Houston, Texas: Boeing Co.)
- NASA (December 2, 2014) "NASA’s Journey to Mars News Briefing" NASA TV
- Mahoney, Erin (2015-09-24). "NASA Releases Plan Outlining Next Steps in the Journey to Mars". NASA. Retrieved 2015-10-12.
- "NASA's Journey To Mars: Pioneering Next Steps in Space Exploration" (PDF). www.nasa.gov. NASA. October 8, 2015. Retrieved October 10, 2015.
- James Griffiths. "Mars simulation crew 'return to Earth' after 365 days in isolation". CNN. Retrieved 2016-08-29.
- Slawson, Nicola; agencies (2016-08-28). "Mars scientists leave dome on Hawaii mountain after year in isolation". The Guardian. ISSN 0261-3077. Retrieved 2016-08-29.
- Kenneth Chang (September 27, 2016). "Elon Musk's Plan: Get Humans to Mars, and Beyond". The New York Times. Retrieved September 18, 2019.
- "Making Life Multi-planetary - RELAYTO/". RELAYTO/. 2018. Retrieved 2019-09-18.
- Shontell, Alyson. "Elon Musk Decided To Put Life On Mars Because NASA Wasn't Serious Enough". Business Insider. Retrieved September 18, 2019.
- Elon Musk on Twitter: Aiming for 150 tons useful load in fully reusable configuration, but should be at least 100 tons, allowing for mass growth Archived 17 June 2019 at the Wayback Machine
- Ralph, Eric. "SpaceX prepares to break ground on Starship launch facilities at Pad 39A". Teslarati. Retrieved 19 September 2019.
- "The Mars Homestead Project—Arrive, Survive, & Thrive!". Marshome.org. Retrieved 2009-09-20.
- "Liftoff for Aurora: Europe's first steps to Mars, the Moon and beyond". October 11, 2002. Retrieved 2007-03-03.
- The "Mars Curse": Why Have So Many Missions Failed?. Universetoday.com (2008-03-22). Retrieved on 2012-08-14.
- Knight, Matthew. "Beating the curse of Mars". Science & Space. Retrieved 2007-03-27.
- Bothwell, William (2008-10-23). "Looking to Mars". Orangeville Citizen. Archived from the original on 2012-07-03. Retrieved 2008-10-29.
- "The Depths of Space: The Story of the Pioneer Planetary Probes (2004)" from The National Academies Press. URL accessed April 7, 2006.
- "Uncovering the Secrets of Mars" (first paragraph only). Time July 14, 1997 Vol. 150 No. 2. URL accessed April 7, 2006.
- Matthews, John & Caitlin. "The Element Encyclopedia of Magical Creatures", Barnes & Noble Publishing, 2005. ISBN 0-7607-7885-X
- Dinerman, Taylor (2004-09-27). "Is the Great Galactic Ghoul losing his appetite?". The space review. Retrieved 2007-03-27.
- Igor Lissov, with comments from Jim Oberg (1996-09-19). "What Really Happened With Mars-96?". Federation of American Scientists. Retrieved 2012-08-20.
- "CNN – Metric mishap caused loss of NASA orbiter – September 30, 1999". cnn.com. Retrieved 9 February 2017.
- Amos, Jonathan (2016-10-20). "Schiaparelli Mars probe's parachute 'jettisoned too early'". BBC News. Retrieved 2016-10-20.
- "Space Images | Schiaparelli Impact Site on Mars, in Color". Jpl.nasa.gov. 2016-10-19. Retrieved 2016-11-04.
- Mars – A Warmer, Wetter Planet by Jeffrey S. Kargel (published July 2004; ISBN 978-1-85233-568-7)
- The Compact NASA Atlas of the Solar System by Ronald Greeley and Raymond Batson (published January 2002; ISBN 0-521-80633-X)
- Mars: The NASA Mission Reports / edited by Robert Godwin (2000) ISBN 1-896522-62-9
|Wikimedia Commons has media related to Mars exploration.|
- NASA Mars exploration website
- Mars Exploration Scientific American Maps and Articles
- Next on Mars (Bruce Moomaw, Space Daily, 9 March 2005): An extensive overview of NASA's Mars exploration plans
- Catalog of Soviet Mars images Collection of Russian Mars probes' images.
- Simplified study of orbits to land on Mars and return to Earth (High School level)
- Planetary Society Mars page
- ^α The diagram includes missions that are active on the surface, such as operational rovers and landers, as well as probes in Mars orbit. The diagram does not include missions that are en route to Mars, or probes that have previously performed a fly-by of Mars and moved on. The two probes of the Mars Cube One mission are counted as a single mission.