Human spaceflight

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"Space traveler" redirects here. For other uses, see Space traveler (disambiguation).
ISS crewmember Tracy Caldwell Dyson views the Earth, 2010

Human spaceflight (also referred to as manned spaceflight) is space travel with a crew aboard the spacecraft. When a spacecraft is crewed, it can be operated directly, as opposed to being remotely operated or autonomous.

The first human spaceflight was launched by the Soviet Union on 12 April 1961 as a part of the Vostok program, with cosmonaut Yuri Gagarin aboard. Humans have been continually present in space for 14 years and 20 days on the International Space Station.

Since the retirement of the US Space Shuttle in 2011, only Russia and China have maintained domestic human spaceflight capability with the Soyuz program and Shenzhou program. Currently, all crewed flights to the International Space Station use Soyuz vehicles, which remain attached to the station to allow quick return if needed. The United States is developing commercial crew transportation to facilitate domestic access to ISS and low Earth orbit, as well as the Orion vehicle for beyond-low Earth orbit applications.

While spaceflight has typically been a government-directed activity, commercial spaceflight has gradually been taking on a greater role. The first private human spaceflight took place on 21 June 2004, when SpaceShipOne conducted a suborbital flight, and a number of non-governmental companies have been working to develop a space tourism industry. NASA has also played a role to stimulate private spaceflight through programs such as Commercial Orbital Transportation Services (COTS) and Commercial Crew Development (CCDev). With its 2011 budget proposals released in 2010,[1] the Obama administration moved towards a model where commercial companies would supply NASA with transportation services of both crew and cargo to low Earth orbit. The vehicles used for these services could then serve both NASA and potential commercial customers. Commercial resupply of ISS began two years after the retirement of the Shuttle, and commercial crew launches could begin by 2017.[2]

History[edit]

Orbital human spaceflight
Name Debut Launches
Vostok 1961 6
Mercury 1962 4
Voskhod 1964 2
Gemini 1965 10
Soyuz 1967 120
Apollo/Skylab 1968 15
Shuttle 1981 135
Shenzhou 2003 5
Suborbital human spaceflight
Name Debut Flights
Mercury 1961 2
X-15 1963 2
(Soyuz 18a, Soyuz T-10-1) 1975, 1983 2
SpaceShipOne 2004 3

First human spaceflights[edit]

The first human spaceflight took place on 12 April 1961, when cosmonaut Yuri Gagarin made one orbit around the Earth aboard the Vostok 1 spacecraft, launched by the Soviet space program. Valentina Tereshkova became the first woman in space aboard Vostok 6 on 16 June 1963. Both spacecraft were launched by Vostok 3KA launch vehicles. Alexei Leonov made the first spacewalk when he left Voskhod 2 on 8 March 1965. Svetlana Savitskaya became the first woman to do so on 25 July 1984.

The United States became the second nation to put a human in space with the suborbital flight of astronaut Alan Shepard aboard Freedom 7 as part of Project Mercury. The spacecraft was launched on 5 May 1961 on a Redstone rocket. The first U.S. orbital flight was that of John Glenn aboard Friendship 7, launched 20 February 1962 on an Atlas rocket. From 1981 to 2011, the U.S. conducted all its human spaceflight missions with reusable space shuttles. Sally Ride became the first American woman in space in 1983. Eileen Collins was the first female shuttle pilot, and with shuttle mission STS-93 in 1999 she became the first woman to command a U.S. spacecraft.

China became the third nation to achieve independent human spaceflight capability when Yang Liwei launched into space on a Chinese-made vehicle, the Shenzhou 5, on 15 October 2003. The first Chinese woman, Liu Yang, was launched in June 2012 aboard Shenzhou 9. Previous European (Hermes) and Japanese (HOPE-X) domestic human spaceflight programs were abandoned after years of development, as was the first Chinese attempt, the Shuguang spacecraft.

The farthest destination for a human spaceflight mission has been the Moon. The only manned missions to the Moon have been those conducted by NASA as part of the Apollo program. The first such mission, Apollo 8, orbited the Moon but did not land. The first Moon landing mission was Apollo 11, during which—on 20 July 1969—Neil Armstrong and Buzz Aldrin became the first people to set foot on the Moon. Six missions landed in total, numbered Apollo 11–17, excluding Apollo 13. Altogether 12 men walked on the Moon, the only humans to have been on an extraterrestrial body. The Soviet Union discontinued its program for lunar orbiting and landing of human spaceflight missions in 1974 when Valentin Glushko became General Designer of NPO Energiya.[3]

The longest single human spaceflight is that of Valeriy Polyakov, who left Earth on 8 January 1994, and did not return until 22 March 1995 (a total of 437 days 17 hr. 58 min. 16 sec.). Sergei Krikalyov has spent the most time of anyone in space, 803 days, 9 hours, and 39 seconds altogether. The longest period of continuous human presence in space is 14 years and 20 days on the International Space Station, exceeding the previous record of almost 10 years (or 3,634 days) held by Mir, spanning the launch of Soyuz TM-8 on 5 September 1989 to the landing of Soyuz TM-29 on 28 August 1999.

For many years beginning in 1961, only two countries, the USSR (later Russia) and the United States, had their own astronauts. Citizens of other nations flew in space, beginning with the flight of Vladimir Remek, a Czech, on a Soviet spacecraft on 2 March 1978. As of 2010, citizens from 38 nations (including space tourists) have flown in space aboard Soviet, American, Russian, and Chinese spacecraft.

Yuri Gagarin, the first person in space, and the first person to orbit the Earth, 1961.
Freedom 7, the first U.S. sub-orbital human space mission
Valentina Tereshkova, the first woman cosmonaut, 1963.
Buzz Aldrin on the surface of the Moon during Apollo 11, 1969

Post-shuttle gap in United States human spaceflight capability[edit]

Under the Bush administration, the Constellation Program included plans for canceling the Shuttle and replacing it with the capability for spaceflight beyond low Earth orbit. In the 2011 United States federal budget, the Obama administration cancelled Constellation for being over budget and behind schedule while not innovating and investing in critical new technologies.[4] For beyond low earth orbit human spaceflight NASA is developing the Orion spacecraft to be launched by the Space Launch System. Under the Commercial Crew Development plan, NASA will rely on transportation services provided by the private sector to reach low earth orbit, such as Space X's Falcon 9/Dragon V2, Sierra Nevada Corporation's Dream Chaser, or Boeing's CST-100. The period between the retirement of the shuttle in 2011 and the initial operational capability of new systems in 2017, similar to the gap between the end of Apollo in 1975 and the first space shuttle flight in 1981, is referred to by a presidential Blue Ribbon Committee as the U.S. human spaceflight gap.[5] Commercial sub-orbital spacecraft aimed at the space tourism market such as Scaled Composites SpaceshipTwo to be operated by Virgin Galactic, and XCOR's Lynx spaceplane are under development and could reach space in 2014[6]

Space programs[edit]

Countries that have had human spaceflight agendas (dark blue)
An Apollo spacecraft with docking equipment, as photographed by the Soyuz crew during the Apollo-Soyuz mission. Human spaceflight has been a forum for both competition and cooperation.

Human spaceflight programs have been conducted by the former Soviet Union/Russian Federation, the United States, the People's Republic of China and by private spaceflight company Scaled Composites.

The Indian Space Research Organization (ISRO) begun work on pre project activities of human space flight mission programme.[7] The objective of Human Spaceflight Programme is to undertake a human spaceflight mission to carry a crew of two to Low Earth Orbit (LEO) and return them safely to a predefined destination on earth. The programme is proposed to be implemented in defined phases. Currently, the pre project activities are progressing with a focus on the development of critical technologies for subsystems such as Crew Module (CM), Environmental control and Life Support System (ECLSS), Crew Escape System, etc. A study for undertaking human space flight to carry human beings to low earth orbit and ensure their safe return has been made by the department. The department has initiated pre-project activities to study technical and managerial issues related to undertaking manned mission with an aim to build and demonstrate the country’s capability. The programme envisages the development of a fully autonomous orbital vehicle carrying 2 or 3 crew members to about 300 km low earth orbit and their safe return.

Several other countries and space agencies have announced and begun human spaceflight programs by their own technology, Japan (JAXA), Iran (ISA) and Malaysia (MNSA).

Currently the following spacecraft and spaceports are used for launching human spaceflights:

Historically, the following spacecraft and spaceports have also been used for human spaceflight launches:

Mir, a former space station where many human spaceflight records were achieved orbiting the Earth
International Space Station under construction

Numerous private companies attempted human spaceflight programs in an effort to win the $10 million Ansari X Prize. The first private human spaceflight took place on 21 June 2004, when SpaceShipOne conducted a suborbital flight. SpaceShipOne captured the prize on 4 October 2004, when it accomplished two consecutive flights within one week. SpaceShipTwo, launching from the carrier aircraft White Knight Two, is planned to conduct regular suborbital space tourism.

Most of the time, the only humans in space are those aboard the ISS, whose crew of six spends up to six months at a time in low Earth orbit.

NASA and ESA use the term "human spaceflight" to refer to their programs of launching people into space. These endeavors have also been referred to as "manned space missions."

Aleksandr Skvortsov (cosmonaut) Soichi Noguchi Timothy Creamer Oleg Kotov Maksim Surayev Jeffrey Williams Nicole Stott Robert Thirsk Roman Romanenko Frank De Winne Timothy Kopra Michael R. Barratt Gennady Padalka Koichi Wakata Sandra Magnus Yuri Lonchakov Michael Fincke Gregory Chamitoff Oleg Kononenko Sergey Volkov Garrett Reisman Léopold Eyharts Daniel Tani Yuri Malenchenko Peggy Whitson Clayton Anderson Oleg Kotov Fyodor Yurchikhin Sunita Williams Mikhail Tyurin Michael Lopez-Alegria Thomas Reiter Jeffrey Williams Pavel Vinogradov Valery Tokarev William McArthur John Philips Sergei Krikalev Salizhan Sharipov Leroy Chiao Michael Fincke Gennady Padalka Alexander Kaleri Michael Foale Edward Lu Yuri Malenchenko Donald Pettit Nikolai Budarin Kenneth Bowersox Sergei Treshchev Peggy Whitson Valery Korzun Carl Walz Daniel Bursch Yury Onufrienko Vladimir Dezhurov Mikhail Tyurin Frank Culbertson James Voss Susan Helms Yuri Usachev Yuri Gidzenko Sergei Krikalev William Shepherd Aleksandr Kaleri Sergei Zalyotin Jean-Pierre Haigneré Viktor Afanasyev Sergei Avdeyev Gennady Padalka Nikolai Budarin Talgat Musabayev Andrew Thomas David Wolf Pavel Vinogradov Anatoly Solovyev Michael Foale Aleksandr Lazutkin Vasili Tsibliyev Jerry Linenger John Blaha Aleksandr Kaleri Valery Korzun Shannon Lucid Yury Usachev Yuri Onufrienko Thomas Reiter Sergei Avdeyev Yuri Gidzenko Nikolai Budarin Anatoly Solovyev Norman Thagard Gennady Strekalov Vladimir Dezhurov Yelena Kondakova Aleksandr Viktorenko Talgat Musabayev Yuri Malenchenko Valeri Polyakov Yury Usachev Viktor Afanasyev Aleksandr Serebrov Vasili Tsibliyev Aleksandr Poleshchuk Gennadi Manakov Sergei Avdeyev Anatoly Solovyev Aleksandr Kaleri Aleksandr Viktorenko Aleksandr Volkov Sergei Krikalev Anatoly Artsebarsky Musa Manarov Viktor Afanasyev Gennady Strekalov Gennadi Manakov Aleksandr Balandin Anatoly Solovyev Aleksandr Serebrov Aleksandr Viktorenko Sergei Krikalev Aleksandr Volkov Valeri Polyakov Musa Manarov Vladimir Titov Aleksandr Aleksandrov Yuri Romanenko Aleksandr Laveykin Vladimir Solovyov Leonid Kizim Vladimir Solovyov Leonid Kizim Alexander Volkov Vladimir Vasyutin Vladimir Dzhanibekov Viktor Savinykh Oleg Atkov Vladimir Solovyov Leonid Kizim Aleksandr Pavlovich Aleksandrov Vladimir Lyakhov Valentin Lebedev Anatoli Berezovoy Viktor Savinykh Vladimir Kovalyonok Valery Ryumin Leonid Popov Valery Ryumin Vladimir Lyankhov Aleksandr Ivanchenkov Vladimir Kovalyonok Gerogi Grencho Yuri Romanenko Yuri Glazkov Viktor Gorbatko Vitali Zholobov Boris Volynov Vitali Sevastyanov Pyotr Klimuk Aleksei Gubarev Georgi Grechko Pavel Popovich Yuri Artyukhin Edward Gibson William Pogue Gerald Carr Owen Garriot Jack Lousma Alan Bean Joeseph Kerwin Paul Weitz Pete Conrad Vladislav Volkov Viktor Patsayev Georgi Dobrovolski ISS Tiangong-1 Skylab Mir Salyut 7 Salyut 6 Salyut 5 Salyut 4 Salyut 3 Salyut 1 SpaceShipOne SpaceShipOne flight 17P SpaceShipOne flight 16P SpaceShipOne flight 15P Shenzhou program Shenzhou 10 Shenzhou 9 Shenzhou 7 Shenzhou 6 Shenzhou 5 Space Shuttle Atlantis STS-135 STS-132 STS-129 STS-125 STS-122 STS-117 STS-115 STS-112 STS-110 STS-104 STS-98 STS-106 STS-101 STS-86 STS-84 STS-81 STS-79 STS-76 STS-74 STS-71 STS-66 STS-46 STS-45 STS-44 STS-43 STS-37 STS-38 STS-36 STS-34 STS-30 STS-27 STS-61-B STS-51-J X-15 X-15 Flight 91 X-15 Flight 90 Space Shuttle Discovery STS-133 STS-131 STS-128 STS-119 STS-124 STS-120 STS-116 STS-121 STS-114 STS-105 STS-102 STS-92 STS-103 STS-96 STS-95 STS-91 STS-85 STS-82 STS-70 STS-63 STS-64 STS-60 STS-51 STS-56 STS-53 STS-42 STS-48 STS-39 STS-41 STS-31 STS-33 STS-29 STS-26 STS-51-I STS-51-G STS-51-D STS-51-C STS-51-A STS-41-D Apollo Program Apollo-Soyuz Test Project Apollo 17 Apollo 16 Apollo 15 Apollo 14 Apollo 13 Apollo 12 Apollo 11 Apollo 10 Apollo 9 Apollo 8 Apollo 7 Space Shuttle Endeavour STS-134 STS-130 STS-127 STS-126 STS-123 STS-118 STS-113 STS-111 STS-108 STS-100 STS-97 STS-99 STS-88 STS-89 STS-77 STS-72 STS-69 STS-67 STS-68 STS-59 STS-61 STS-57 STS-54 STS-47 STS-49 Space Shuttle Challenger STS-51-L STS-61-A STS-51-F STS-51-B STS-41-G STS-41-C STS-41-B STS-8 STS-7 STS-6 Project Gemini Gemini XII Gemini XI Gemini X Gemini IX-A Gemini VIII Gemini VI-A Gemini VII Gemini V Gemini IV Gemini III Gemini 2 Gemini 1 Space Shuttle Columbia STS-107 STS-109 STS-93 STS-90 STS-87 STS-94 STS-83 STS-80 STS-78 STS-75 STS-73 STS-65 STS-62 STS-58 STS-55 STS-52 STS-50 STS-40 STS-35 STS-32 STS-28 STS-61-C STS-9 STS-5 STS-4 STS-3 STS-2 STS-1 Skylab Skylab 4 Skylab 3 Skylab 2 Project Mercury Mercury-Atlas 9 Mercury-Atlas 8 Mercury-Atlas 7 Mercury-Atlas 6 Mercury-Redstone 4 Mercury-Redstone 3 Soyuz programme Soyuz TMA-12M Soyuz TMA-11M Soyuz TMA-10M Soyuz TMA-09M Soyuz TMA-08M Soyuz TMA-07M Soyuz TMA-06M Soyuz TMA-05M Soyuz TMA-04M Soyuz TMA-03M Soyuz TMA-22 Soyuz TMA-02M Soyuz TMA-21 Soyuz TMA-20 Soyuz TMA-01M Soyuz TMA-19 Soyuz TMA-18 Soyuz TMA-17 Soyuz TMA-16 Soyuz TMA-15 Soyuz TMA-14 Soyuz TMA-13 Soyuz TMA-12 Soyuz TMA-11 Soyuz TMA-10 Soyuz TMA-9 Soyuz TMA-8 Soyuz TMA-7 Soyuz TMA-6 Soyuz TMA-5 Soyuz TMA-4 Soyuz TMA-3 Soyuz TMA-2 Soyuz TMA-1 Soyuz TM-34 Soyuz TM-33 Soyuz TM-32 Soyuz TM-31 Soyuz TM-30 Soyuz TM-29 Soyuz TM-28 Soyuz TM-27 Soyuz TM-26 Soyuz TM-25 Soyuz TM-24 Soyuz TM-23 Soyuz TM-22 Soyuz TM-21 Soyuz TM-20 Soyuz TM-19 Soyuz TM-18 Soyuz TM-17 Soyuz TM-16 Soyuz TM-15 Soyuz TM-14 Soyuz TM-13 Soyuz TM-12 Soyuz TM-11 Soyuz TM-10 Soyuz TM-9 Soyuz TM-8 Soyuz TM-7 Soyuz TM-6 Soyuz TM-5 Soyuz TM-4 Soyuz TM-3 Soyuz TM-2 Soyuz T-15 Soyuz T-14 Soyuz T-13 Soyuz T-12 Soyuz T-11 Soyuz T-10 Soyuz T-10-1 Soyuz T-9 Soyuz T-8 Soyuz T-7 Soyuz T-6 Soyuz T-5 Soyuz 40 Soyuz 39 Soyuz T-4 Soyuz T-3 Soyuz 38 Soyuz 37 Soyuz T-2 Soyuz 36 Soyuz 35 Soyuz 34 Soyuz 33 Soyuz 32 Soyuz 31 Soyuz 30 Soyuz 29 Soyuz 28 Soyuz 27 Soyuz 26 Soyuz 25 Soyuz 24 Soyuz 23 Soyuz 22 Soyuz 21 Soyuz 19 Soyuz 18 Soyuz 18a Soyuz 17 Soyuz 16 Soyuz 15 Soyuz 14 Soyuz 13 Soyuz 12 Soyuz 11 Soyuz 10 Soyuz 9 Soyuz 8 Soyuz 7 Soyuz 6 Soyuz 5 Soyuz 4 Soyuz 3 Soyuz 1 Voskhod programme Vostok programme

National spacefaring attempts[edit]

This section lists all nations which have explored human spaceflight programs. This should not to be confused with nations with citizens who have traveled into space including space tourists, flown or intended to fly by foreign country's or non-domestic private space systems – these are not counted as national spacefaring attempts in this list.
Nation/Organization Space agency Term(s) for space traveler First launched astronaut Date Spacecraft Launcher Type
 Union of Soviet Socialist Republics
(1922–1991)
Soviet space program
(OKB-1 Design Bureau)
космонавт (same word in:) (Russian)(Ukrainian)
kosmonavt
cosmonaut
Ғарышкер(Kazakh)
Yuri Gagarin 12 April 1961 Vostok spacecraft Vostok Orbital
 United States of America National Aeronautics and Space Administration (NASA) astronaut
spaceflight participant
Alan Shepard (suborbital) 5 May 1961 Mercury spacecraft Redstone Suborbital
 United States of America National Aeronautics and Space Administration (NASA) astronaut
spaceflight participant
John Glenn (orbital) 20 February 1962 Mercury spacecraft Atlas LV-3B Orbital
 People's Republic of China Space program of the People's Republic of China 宇航员 (Chinese)
yǔhángyuán
航天员 (Chinese)
hángtiānyuán
taikonaut
... 1973 (abandoned) Shuguang 1 Long March 2A
 People's Republic of China Space program of the People's Republic of China 宇航员 (Chinese)
yǔhángyuán
航天员 (Chinese)
hángtiānyuán
... 1981 (abandoned) Piloted FSW Long March 2
Not the esa logo.png European Space Agency CNES / European Space Agency (ESA) spationaute (French)
astronaut
... 1992 (abandoned) Hermes Ariane V
 Russia
Russian Federal Space Agency (Roscosmos)
космонавт (Russian)
kosmonavt
cosmonaut
Alexander Viktorenko, Alexander Kaleri 17 March 1992 Soyuz-TM Soyuz-U2 Soyuz TM-14 to MIR
Iraq Ba'athist Iraq
(1968–2003)[9]
... رجل فضاء (Arabic)
rajul faḍāʼ
رائد فضاء (Arabic)
rāʼid faḍāʼ
ملاح فضائي (Arabic)
mallāḥ faḍāʼiy
... 2001 (abandoned) ... Tammouz 2 or 3
Japan State of Japan National Space Development Agency of Japan (NASDA) 宇宙飛行士 (Japanese)
uchūhikōshi or
アストロノート
astoronoto
... 2003 (abandoned) HOPE-X H-II
 People's Republic of China China National Space Administration (CNSA) 太空人 (Chinese)
tàikōng rén
宇航员 (Chinese)
yǔhángyuán
航天员 (Chinese)
hángtiānyuán
Yang Liwei 15 October 2003 Shenzhou spacecraft Long March 2F Orbital
India India Indian Space Research Organisation (ISRO) Vyomanaut
 (Sanskrit)
... after 2017 [10] Orbital Vehicle (OV) GSLV Mk II
Iran Islamic Republic of Iran Iranian Space Agency (ISA) کیهان نورد (Persian)
kayhan navard [11]
... 2017 (planned)[12][13] ISA manned spacecraft ...
Not the esa logo.png European Space Agency European Space Agency (ESA) astronaut ... 2020 (approved conceptually but full development not begun)[14][15][16][17] ARV phase-2 Ariane V
Japan State of Japan Japan Aerospace Exploration Agency (JAXA) 宇宙飛行士 (Japanese)
uchūhikōshi or
アストロノート
astoronoto
... 2025 (planned)[citation needed] HTV-based spacecraft H-IIB

Safety concerns[edit]

Planners of human spaceflight missions face a number of safety concerns.

Life support[edit]

Main article: Life support system

The immediate needs for breathable air and drinkable water are addressed by the life support system of the spacecraft.

Medical issues[edit]

Medical consequences such as possible blindness and bone loss have been associated with human space flight.[18][19]

On 31 December 2012, a NASA-supported study reported that spaceflight may harm the brain of astronauts and accelerate the onset of Alzheimer's disease.[20][21][22]

Effects of microgravity[edit]

See also: Weightlessness
Bruce McCandless floating free in orbit with a space suit and Manned Maneuvering Unit.

Medical data from astronauts in low earth orbits for long periods, dating back to the 1970s, show several adverse effects of a microgravity environment: loss of bone density, decreased muscle strength and endurance, postural instability, and reductions in aerobic capacity. Over time these deconditioning effects can impair astronauts’ performance or increase their risk of injury.[23]

In a weightless environment, astronauts put almost no weight on the back muscles or leg muscles used for standing up. Those muscles then start to weaken and eventually get smaller. If there is an emergency at landing, the loss of muscles, and consequently the loss of strength can be a serious problem. Sometimes, astronauts can lose up to 25% of their muscle mass on long term flights. When they get back to ground, they will be considerably weakened and will be out of action for a while.[citation needed]

Astronauts experiencing weightlessness will often lose their orientation, get motion sickness, and lose their sense of direction as their bodies try to get used to a weightless environment. When they get back to Earth, or any other mass with gravity, they have to readjust to the gravity and may have problems standing up, focusing their gaze, walking and turning. Importantly, those body motor disturbances after changing from different gravities only get worse the longer the exposure to little gravity.[citation needed] These changes will affect operational activities including approach and landing, docking, remote manipulation, and emergencies that may happen while landing. This can be a major roadblock to mission success.[citation needed]

In addition, after long space flight missions, male astronauts may experience severe eyesight problems.[24][25][26][27][28] Such eyesight problems may be a major concern for future deep space flight missions, including a manned mission to the planet Mars.[24][25][26][27][29]

Radiation[edit]

Without proper shielding, the crews of missions beyond low Earth orbit (LEO) might be at risk from high-energy protons emitted by solar flares. Lawrence Townsend of the University of Tennessee and others have studied the most powerful solar flare ever recorded. That flare was seen by the British astronomer Richard Carrington in September 1859. Radiation doses astronauts would receive from a Carrington-type flare could cause acute radiation sickness and possibly even death.[30]

Another type of radiation, galactic cosmic rays, presents further challenges to human spaceflight beyond LEO.[31]

Radiation damage to the immune system[edit]
The Earth at night and a person inside the ISS Cupola

There is also some scientific concern that extended spaceflight might slow down the body’s ability to protect itself against diseases.[32] Some of the problems are a weakened immune system and the activation of dormant viruses in the body. Radiation can cause both short and long term consequences to the bone marrow stem cells which create the blood and immune systems. Because the interior of a spacecraft is so small, a weakened immune system and more active viruses in the body can lead to a fast spread of infection.[citation needed]

Isolation[edit]

During long missions, astronauts are isolated and confined into small spaces. Depression, cabin fever and other psychological problems may impact the crew's safety and mission success.[citation needed]

Astronauts may not be able to quickly return to Earth or receive medical supplies, equipment or personnel if a medical emergency occurs. The astronauts may have to rely for long periods on their limited existing resources and medical advice from the ground.

Launch safety[edit]

Reentry safety[edit]

Reliability[edit]

Fatality risk[edit]

As of 2010, 18 crew members have died during actual spaceflight missions (see table). Over 100 others have died in accidents during activity directly related to spaceflight missions or testing.

Year #of

Deaths

Mission Known or likely cause
1967 1 Soyuz 1 Trauma from crash landing
1971 3 Soyuz 11 Asphyxia
1986 7 Space Shuttle Challenger Asphyxia from cabin breach or trauma from water impact[33]
2003 7 Space Shuttle Columbia Asphyxia from cabin breach, trauma from dynamic load environment as orbiter broke up[34]

See also[edit]

References[edit]

Citations[edit]

  1. ^ "FY 2011 Budget". NASA. 
  2. ^ "NASA Hails Success of Commercial Space Program". nasa.gov. Retrieved 24 July 2014. 
  3. ^ Siddiqi, Asif. Challenge To Apollo The Soviet Union and The Space Race, 1945–1974. NASA. p. 832. 
  4. ^ Congressional watchdog finds NASA’s new rocket is in trouble. Orlando Sentinel blog summary of official reports. 3 November 2008
  5. ^ Klamper, Amy (8 September 2009) White House Panel Spells Out Human Spaceflight Options for NASA. Space News
  6. ^ http://www.space.com/24249-commercial-space-travel-blasts-off-2014.html
  7. ^ The Indian Space Research Organization (ISRO)Future Programme.
  8. ^ "X-15 Hypersonic Research Program". NASA. 
  9. ^ According to a press-release of Iraqi News Agency of 5 December 1989 about the first (and last) test of the Tammouz space launcher, Iraq intended to develop manned space facilities by the end of the century. These plans were put to an end by the Gulf War of 1991 and the economic hard times that followed.
  10. ^ Press Trust of India. "Human space flight mission off ISRO priority list". Retrieved 18 August 2013. 
  11. ^ كيهان نورد (cosmonaut). Noojum.com. Retrieved on 7 August 2011.
  12. ^ PressTV: 'Iran to put astronaut in space in 2017'. Presstv.ir. Retrieved on 7 August 2011.
  13. ^ "Iran aims to send man into space by 2019". BBC News. 23 July 2010. 
  14. ^ Amos, Jonathan (7 July 2009). "Europe targets manned spaceship". BBC News. Retrieved 27 March 2010. 
  15. ^ Apollo-like capsule chosen for Crew Space Transportation System, 22 May 2008
  16. ^ "Jules Verne" Automated Transfer Vehicle (ATV) Re-entry. Information Kit (PDF) . Updated September 2008. European Space Agency. Retrieved on 7 August 2011.
  17. ^ Amos, Jonathan (26 November 2008). "Europe's 10bn-euro space vision". BBC News. Retrieved 27 March 2010. 
  18. ^ Chang, Kenneth (27 January 2014). "Beings Not Made for Space". New York Times. Retrieved 27 January 2014. 
  19. ^ Mann, Adam (23 July 2012). "Blindness, Bone Loss, and Space Farts: Astronaut Medical Oddities". Wired. Retrieved 23 July 2012. 
  20. ^ Cherry, Jonathan D.; Frost, Jeffrey L.; Lemere, Cynthia A.; Williams, Jacqueline P.; Olschowka, John A.; O'Banion, M. Kerry (2012). "Galactic Cosmic Radiation Leads to Cognitive Impairment and Increased Aβ Plaque Accumulation in a Mouse Model of Alzheimer’s Disease". PLOS ONE 7 (12): e53275. doi:10.1371/journal.pone.0053275. PMC 3534034. PMID 23300905. Retrieved 7 January 2013. 
  21. ^ "Study Shows that Space Travel is Harmful to the Brain and Could Accelerate Onset of Alzheimer's". SpaceRef. 1 January 2013. Retrieved 7 January 2013. 
  22. ^ Cowing, Keith (3 January 2013). "Important Research Results NASA Is Not Talking About (Update)". NASA Watch. Retrieved 7 January 2013. 
  23. ^ "Exploration Systems Human Research Program – Exercise Countermeasures". NASA. 
  24. ^ a b Mader, T. H. et al. (2011). "Optic Disc Edema, Globe Flattening, Choroidal Folds, and Hyperopic Shifts Observed in Astronauts after Long-duration Space Flight". Ophthalmology (journal) 118 (10): 2058–2069. doi:10.1016/j.ophtha.2011.06.021. PMID 21849212. 
  25. ^ a b Puiu, Tibi (9 November 2011). "Astronauts’ vision severely affected during long space missions". zmescience.com. Retrieved 9 February 2012. 
  26. ^ a b News (CNN-TV, 02/09/2012) – Video (02:14) – Male Astronauts Return With Eye Problems
  27. ^ a b "Spaceflight Bad for Astronauts' Vision, Study Suggests". Space.com. 13 March 2012. Retrieved 14 March 2012. 
  28. ^ Kramer, Larry A. et al. (13 March 2012). "Orbital and Intracranial Effects of Microgravity: Findings at 3-T MR Imaging". Radiology (journal). doi:10.1148/radiol.12111986. Retrieved 14 March 2012. 
  29. ^ Fong, MD, Kevin (12 February 2014). "The Strange, Deadly Effects Mars Would Have on Your Body". Wired (magazine). Retrieved 12 February 2014. 
  30. ^ Battersby, Stephen (21 March 2005). "Superflares could kill unprotected astronauts". New Scientist. 
  31. ^ Space Radiation Hazards and the Vision for Space Exploration. NAP. 2006. ISBN 0-309-10264-2. 
  32. ^ Gueguinou, N.; Huin-Schohn, C.; Bascove, M.; Bueb, J.-L.; Tschirhart, E.; Legrand-Frossi, C.; Frippiat, J.-P. (2009). "Could spaceflight-associated immune system weakening preclude the expansion of human presence beyond Earth's orbit". Journal of Leukocyte Biology 86 (5): 1027–1038. doi:10.1189/jlb.0309167. PMID 19690292. 
  33. ^ "Report from Joseph P. Kerwin, biomedical specialist from the Johnson Space Center in Houston, Texas, relating to the deaths of the astronauts in the Challenger accident". NASA. 
  34. ^ "COLUMBIA CREW SURVIVAL INVESTIGATION REPORT". NASA.gov. NASA. Retrieved July 2014. 

Bibliography[edit]

  • David Darling: The complete book of spaceflight. From Apollo 1 to Zero gravity. Wiley, Hoboken NJ 2003, ISBN 0-471-05649-9.
  • Wiley J. Larson (Hrsg.): Human spaceflight – mission analysis and design. McGraw-Hill, New York NY 2003, ISBN 0-07-236811-X.
  • Donald Rapp: Human missions to Mars – enabling technologies for exploring the red planet. Springer u. a., Berlin u. a. 2008, ISBN 978-3-540-72938-9.
  • Haeuplik-Meusburger: Architecture for Astronauts – An Activity based Approach. Springer Praxis Books, 2011, ISBN 978-3-7091-0666-2

External links[edit]