List of The Universe episodes

This is a list of the currently released and yet to be released episodes of The History Channel's television Series The Universe.

Episode List

Season 1: 2007

#	Title	Original airdate
01	"Secrets of the Sun"	May 29, 2007 (2007-05-29)
It is a fireball in the sky, a bubbling, boiling, kinetic sphere of white hot plasma, exploding and erupting. Its size is almost unimaginable--one million Earths would fit within its boundaries. In this violence is born almost all the energy that makes existence on Earth possible, yet, its full mysteries are only now beginning to be understood. From Sun spots to solar eclipses, solar flares to solar storms, the birth of the sun to its potential death, discover the science and history behind this celestial object that makes life on Earth exist.
02	"Mars: The Red Planet"	June 5, 2007 (2007-06-05)
It has been fifty years since man first ventured into space, but the greatest secrets are yet to be revealed. Mars is the planet in our solar system most similar to Earth despite otherworldly features such as the largest volcano in the Solar System. Rumors of life on Mars may be substantiated as NASA orbiters and rovers discover new evidence of frozen water just beneath the rusty soil. Did alien life exist there? As Earth reels with the effects of global warming, Mars becomes the most likely candidate for eventual human habitation. Cutting-edge computer graphics are used to show what life would be like on Mars, and to imagine what kind of life forms might evolve in alien atmospheres.
03	"End of the Earth"	June 12, 2007 (2007-06-12)
Asteroids, comets, gamma ray bursts and the sun all combine to make the Earth a dangerous place to live. NASA's top brass and other scientists are arming themselves with the latest technology to pre-empt an apocalyptic attack. Watch and investigate bizarre, and terrifying apocalyptic scenarios and the ways that scientists are racing against the clock to develop technology to defend our planet.
04	"Jupiter: The Giant Planet"	June 19, 2007 (2007-06-19)
Jupiter poses many questions about our solar system. It is a powerful planet of gas whose flowing colors and spots are beautiful, but contain violent storms and jet streams. A mini solar system of over sixty moons rotate around Jupiter--a half billion miles from earth. Could one of these moons contain life under its icy crust?
05	"The Moon"	June 26, 2007 (2007-06-26)
The moon has comforted man for thousands of years. It's been everything from a god to a compass, and the only cosmic body human beings have ever visited. NASA is planning to build a permanent outpost there. Discover how the moon came to be--if you don't already know, you will be astounded.
06	"Spaceship Earth"	July 10, 2007 (2007-07-10)
Take a high performance ride through the formation of the third planet from the Sun, Earth. A survivor of one of the most violent "neighborhoods" in the universe, learn how earth was created and discover what creatures hold clues to how life began. What evil forces threaten the demise of Earth? Complex and controversial, this is the scientific detective story of all time. Cutting-edge graphics are used along with the stories of scientists and explorers who dare to venture into the uncharted territory of the cosmos.
07	"Mercury & Venus: The Inner Planets"	July 17, 2007 (2007-07-17)
Scorched by their proximity to the sun, Mercury and Venus are hostile worlds; one gouged with craters from cosmic collisions and the other a vortex of sulfur, carbon dioxide and acid rain. Prime examples of planets gone awry, do they serve as a warning for ominous scenarios that might someday threaten Earth? Cutting-edge computer graphics are used to show what life would be on other planets and to imagine what kind of life forms might evolve in alien atmospheres.
08	"Saturn: Lord of the Rings"	July 24, 2007 (2007-07-24)
Are the rings of Saturn a real celestial phenomenon or merely a cosmic Illusion? Technology allows the experts to get closer to the furthest planet visible to the naked eye. Old questions are answered and new ones arise. Does Saturn hold the key to Earth's weather and will one of its moons supply us with all the oil we'll ever need? Cutting-edge computer graphics are used to show what life would be like on other planets and to imagine what kinds of life forms might evolve in alien atmospheres.
09	"Alien Galaxies"	July 31, 2007 (2007-07-31)
To know our place in the universe take a look far, far away to the realm of Alien Galaxies. Our galaxy is one of hundreds of billions in the universe. The Milky Way consists of more than a billion stars, our sun being only one of them. Take a view of the universe through the Hubble Space telescope and go back almost all the way to the Big Bang. Cutting-edge computer graphics are used to bring the universe down to earth to show what life would be like on other planets, and to imagine what life forms might evolve in alien atmospheres.
10	"Life & Death of a Star"	August 7, 2007 (2007-08-07)
Ignited by the power of the atom, burning with light, heat and wrath, stars are anything but peaceful. They collide, devour each other, and explode in enormous supernovas--the biggest explosions in the Universe. Using cutting-edge computer graphics, never-before-seen satellite images, and interviews with the world's leading astronomers, take a front row seat to the most amazing light show in the cosmos.
11	"The Outer Planets"	August 14, 2007 (2007-08-14)
New discoveries regarding the Outer Planets are creating a fundamental rethinking of our solar system. Uranus is a toxic combination of hydrogen, helium and methane. Scientists speculate that the planet was knocked on its side after colliding with another body. Neptune's largest moon, Triton, is cold and barren, but some scientists speculate that liquid water might exist under Triton's icy surface. If this is proven true, Triton could be the home to one of the biggest discoveries of all time. Cold and inhospitable, Pluto completes one orbit around the solar system every 248 years. Cutting-edge computer graphics are used to bring the universe down to earth to show what life would be like on other planets, and to imagine what kind of life forms might evolve in alien atmospheres.
12	"Most Dangerous Places"	August 21, 2007 (2007-08-21)
Take a tour of the cosmic hot zones--black holes, galaxy mergers, gamma ray bursts and magnetars. Super massive black holes can figuratively "lasso" the Earth out of the solar system. A clash between two galaxies can result in a barbaric ritual called "galactic cannibalism" in which the dominant galaxy's super massive black hole eats the weaker one. Magnetars are a cosmic magnetic force so strong it could wipe out data on every credit card on the planet.
13	"Search for ET"	August 28, 2007 (2007-08-28)
In a galaxy filled with a billion stars, in a universe filled with a hundred billion galaxies--are we alone? SETI--the Search for Extraterrestrial Intelligence--is a privately funded project using radio telescopes and optical telescopes to scan the stars for signals. NASA is planning missions to Mars, Jupiter's sixth moon, Europa, and Saturn's largest moon, Titan, to look for primitive, microbial life in ice concentrations. Whether we discover primitive or intelligent life, how will that knowledge impact humankind's view of itself? Cutting-edge computer graphics are used to bring the universe down to earth to show what life would be like on other planets, and to imagine what kind of life forms might evolve in alien atmospheres.
14	"Beyond the Big Bang"	September 9, 2007 (2007-09-09)
The universe began with a massive expansion, billions and billions of years ago, and it continues to expand with every passing second. The idea that the universe, and man's very existence, began with a "Big Bang" is no longer a topic of debate among most scientists--it is essentially taken as fact. How has man come to this conclusion, and how has our knowledge evolved so that we can recreate the very first seconds of our universe and all that has developed since? Interviews with the world's leading physicists and historians are woven together with animated recreations and first-person accounts to explain concepts such as the formation of galaxies, the creation of elements and the formation of Earth itself.

Season 2: 2007-2008

#	Title	Original airdate
01	"Alien Planets"	November 27, 2007 (2007-11-27)
Have planet hunters finally found proof of other Earthlike worlds? Astronomers have now discovered over two hundred alien worlds, beyond our solar system, that were unknown just a decade ago. Discover planets that rage with fiery hurricanes and bizarre planets covered by water so dense that it forms a kind of hot ice. Among these weird worlds, Earth actually seems like the oddball.
02	"Cosmic Holes"	December 4, 2007 (2007-12-04)
Today, we know black holes exist, and now scientists are trying to confirm that other holes lurk in hyperspace. Our infinite cosmos could contain a variety of "holes" such as black, white, "mini," and wormholes. White holes are the reverse of black holes; instead of matter being sucked into it, matter is ejected out. Wormholes are gateways in the fabric of space and time. They are included in Einstein's field equations as possibilities for their existence. Neither white holes nor wormholes have ever been found. Learn about new discoveries including, colliding binary black holes, intermediate black holes and manufacturing mini black holes.
03	"Mysteries of the Moon"	December 11, 2007 (2007-12-11)
For thousands of years, mankind has found comfort in the Moon's presence. It's been a lantern for nighttime travelers, a timekeeper for farmers, and a location finder for sailors at sea. For some cultures, it's even been a god. It's the only cosmic body ever visited by human beings. From afar, the Moon's luminance has captivated us since the beginning of time. And a closer look at the beacon in the dark sky reveals an ever-present source of myth, intrigue, controversy, and unsolved mysteries. The field of science may cast an empirical light on some things about the Universe, but lunar experts are the first to admit they don't have all the answers when it comes to our Moon. This episode explores the theories behind Lunar Transient Phenomena that have left scientists stumped for centuries; takes to the Canadian waters to see how the Moon effects our planet through tides; and dusts off some age-old myths and weighs arguments that without our Moon, humanity may not even exist.
04	"The Milky Way"	December 18, 2007 (2007-12-18)
We used to think that Earth was at the center of the universe, but now we know we're not even at the center of our own galaxy. Countless wonders exist between where earth is situated and the massive black hole at the galactic center of our galaxy. Within the Milky Way can be found the debris of old, dying stars fueling the birth of new stars and at the galactic center hypervelocity stars get catapulted clear beyond the Milky Way's outer rim at unimaginable speeds. Come along for a guided tour of 100,000 light-year-wide family of stars and stellar phenomena we call The Milky Way.
05	"Alien Moons"	January 8, 2008 (2008-01-08)
Travel from the inner solar system to the Kuiper Belt and explore the moons surrounding the planets of the solar system. Many of these moons that were once unknown are now on the cutting edge of astronomical study. Some burst with volcanic fury another spews icy geysers and others offer the possibility of alien life. Are these strange worlds simply hostile environments unfit for humans or do other possibilities exist? Cutting-edge computer graphics are used to bring the universe down to earth and to imagine what kind of life forms might evolve in alien atmospheres.
06	"Dark Matter/Dark Energy"	January 15, 2008 (2008-01-15)
Scientists have no idea what they are, but dark matter and dark energy make up 96% of the Universe. Dark Matter is everywhere. It passes through everything we know on earth at billions of particles every second, yet no one has ever gotten a direct detection of this mysterious dark substance. An even more bewildering force is Dark Energy, which is rapidly pushing apart our Universe. Discovered only ten years ago, scientists are struggling to comprehend its unusual characteristics and answer the ultimate question; what is the fate of our Universe? Using cutting-edge computer graphics watch as the universe is brought down to earth.
07	"Astrobiology"	January 29, 2008 (2008-01-29)
Does life exist on other planets? Astrobiology is a visionary new science that searches for life in space by combining the disciplines of astronomy, biology, and geology. How did life evolve on Earth? What will life look like on other planets? These and other pertinent questions will be answered by a diverse group of scientists. Viewers will visit the Pilbara region of West Australia where the oldest evidence of life on Earth has been discovered. Travel to the moons of Jupiter and Saturn to test a theory that life could exist in the clouds of Venus. Finally, watch as experiments are done to see if life exists on exoplanets, earth-like planets beyond our solar system.
08	"Space Travel"	February 5, 2008 (2008-02-05)
When man finally broke free of the Earth's gravitational pull the dream of traveling to other planets became a reality. Today scientists are proposing a bizarre array of technologies in the hope of traveling faster through space: from space craft sporting sails that catch laser beams, to propulsion engines powered by a bizarre entity known as anti-matter. Finally explore the science behind the seemingly fanciful notion of warp-drive and a theoretical particle that can travel faster than light.
09	"Supernovas"	February 12, 2008 (2008-02-12)
A stellar explosion, the supernova is the sensational death of a star. It can shine as bright as 100 billion Suns and radiate as much energy as the Sun would emit over 10 billion years. Jets of high-energy light and matter are propelled into space and can cause massive Gamma Ray Bursts and emit intense X-ray radiation for thousands of years. Astronomers believe that this process creates the very building blocks of planets, people and plants. Meet the world's leading Supernova hunters, and take a look at recorded supernovas throughout history.
10	"Constellations"	February 19, 2008 (2008-02-19)
A constellation is a group of stars that are connected together to form a figure or picture. Explore some of the 88 official constellations and learn about some of the highlights of each.
11	"Unexplained Mysteries"	February 26, 2008 (2008-02-26)
Explore the myths, misconceptions, truths, and amazing mysteries of our unique universe. Could life exist on Mars? Is time travel possible & does Einstein's theory of relativity support it?
12	"Cosmic Collisions"	March 4, 2008 (2008-03-04)
It's been said that our universe is a cosmic shooting gallery. Gravity is moving everything around and things are bound to collide. Astronomers are attempting to understand how these collisions occur in the dark recesses of space. Learn about collisional families, which are clusters of comets and asteroids; planetary collisions; mass extinction impacts involving asteroids and comets; stars collisions; and galaxy cluster collisions. Cutting-edge computer graphics are used to bring this series down to earth as the heavens yield their greatest secrets.
13	"Colonizing Space"	March 11, 2008 (2008-03-11)
Space colonization is no longer the fodder of science fiction, it is becoming a reality. Examine the efforts underway to establish a human colony on Mars, including how they plan to grow food, recycle wastewater and introduce greenhouse gases to revive the red planet and make it more habitable for humans. Cutting-edge computer graphics are used to bring the universe down to earth to show what life would be like on Mars, and to imagine what kind of life forms might evolve in alien atmospheres.
14	"Nebulas"	April 1, 2008 (2008-04-01)
Take a tour through the "Art Gallery of the Galaxy" and view what are considered the "crown jewels" of the heavens. Nebulas are mysterious clouds of gas that aren't classified as stars, planets, moons or asteroids. Astronomers use the most sophisticated techniques to view them since they are practically invisible to the naked eye. Nothing less than stunning, nebulas glow, reflect or obscure the galaxy's light with amazing swirls of color. Nebulas mark the regions where the nothingness of space first coalesces, where stars are born and where stars die. Cutting-edge computer graphics are used to bring the universe down to earth.
15	"Wildest Weather in the Cosmos"	April 8, 2008 (2008-04-08)
Imagine a tornado so powerful, it can form a planet, or winds sweeping across a planet but blowing at 6,000 miles per hour! How about rain made of iron? Sounds like science fiction, but this type of weather is occurring daily in our solar system. Scientists are just beginning to unlock the secrets of these planets and their atmospheres. Can this research help scientists solve long unanswered questions that we have about Earth? As our own planet churns with the effects of global warming, it's natural to look into the heavens and wonder about the rest of the real estate.
16	"Biggest Things in Space"	April 15, 2008 (2008-04-15)
We can't compare anything on earth to the biggest things known in space. The Cosmic Web may connect objects in the universe with threads of dark matter. The Lyman-alpha blob is a bubble like structure containing countless galaxies—perhaps the biggest object in the entire universe. Regions of radio-emitting gas called "radio lobes" could be even bigger. Then there are super-galaxy clusters which are hundreds of galaxies merged together due to cosmic collisions. Discover which is the largest planet, star, star cluster, constellation, black hole, volcano, galaxy, explosions, moon, storm, impact crater and "void" in space.
17	"Gravity"	April 22, 2008 (2008-04-22)
Gravity is pervasive and penetrating. Gravity binds us together, its reach hangs stars in the sky and its grip crushes light. Gravity holds planets together, and leashes them to their suns. Without gravity, stars, comets, moons, nebulae, and even the Earth itself would not exist. Explore how science and humanity discovered, overcame and utilized gravity. Learn what it takes to propel objects into the heavens, to ride a wave or to ski down a slope. Take a front row seat as an astronaut subjects himself to the weightless wonders of the specially modified aircraft used to train astronauts known as the "Vomit Comet."
18	"Cosmic Apocalypse"	April 28, 2008 (2008-04-28)
The Universe as we know it is condemned to death. Space, matter and even time will one day cease to exist and there's nothing we can do about it. Harsh realities are revealed about the future of our Universe; it may collapse and burn or it might be gripped by a galactic ice age. Either of these scenarios might be a long way off. However, our Universe could suddenly be destroyed by a "random quantum fluctuation", a bubble of destruction that can obliterate the entire cosmos in the blink of an eye. No matter how it ends, life in our Universe is doomed.

Season 3: 2008-2009

#	Title	Original airdate
01	"Deep Space Disasters"	November 11, 2008 (2008-11-11)
In space travel there is a saying that the first 50 miles and the last 50 miles are the most dangerous. Explore the controlled explosion of launch, the fiery crucible of reentry and everything in between. See how a single spark inside a spacecraft or a micrometeoroid less than an inch wide hitting a space station can turn a routine mission into a lethal nightmare. As the missions become longer, venturing to Mars and beyond, the potential disasters will only become bigger. What would happen if a spacecraft ventured too close to a black hole or was hit by a gamma ray burst?
02	"Parallel Universes"	November 18, 2008 (2008-11-18)
Some of the world's leading physicists believe they have found startling new evidence showing the existence of universes other than our own. One possibility is that the universe is so vast that an exact replica of our Solar System, our planet and ourselves exists many times over. These Doppelganger Universes exist within our own Universe; in what scientists now call "The Multiverse." Today, trailblazing experiments by state of the art particle colliders are looking for evidence of higher dimensions and Parallel Universes. If proof is found, it will change our lives, our minds, our planet, our science and our universe.
03	"Light Speed"	November 25, 2008 (2008-11-25)
According to the laws of physics we can never travel faster than the speed of light...or can we? Light speed allows us to see things instantly here on Earth, and shows us the entire history of the universe going back nearly 14 billion years. Learn all about light speed, the ultimate constant in the universe and discover ways scientists envision breaking the "light barrier" which may be the only way the star travel of our imaginations ever comes to reality.
04	"Sex in Space"	December 2, 2008 (2008-12-02)
As man moves to colonize the cosmos, the realities of sexual relationships and reproduction need to be addressed. Probe the physiological, psychological and cultural challenges of sex in space. From the sex act through birth, look at how the extreme environments of space exploration might affect copulation, conception and developing human tissues, as well as how issues around sex might impact the emotional lives of astronauts. Get to the bottom of the rumors to find out if space sex has already happened, and look at how the burgeoning space tourism business may soon lead to a boom in space sex.
05	"Alien Faces"	December 9, 2008 (2008-12-09)
They soar through the heavens, fly through the oceans and glide along land. But these are not creatures found on a wildlife safari. These are life forms from another planet. Armed with scientific fact and a little imagination, experts come together to take you on an unprecedented journey to the edges of our imagination.
06	"Deadly Comets and Meteors"	December 16, 2008 (2008-12-16)
Asteroids and comets and their effects, both good and bad, are examined. How these celestial bodies played a part in the formation of our solar system is also examined. Their possible role in the extinction of the dinosaurs as well as theories that comet dust may carry dead viruses.
07	"Living in Space"	December 23, 2008 (2008-12-23)
When mankind eventually leaves the cradle of Earth and ventures forth into the uncharted territories of the cosmos, where, and what form, will our new homes take? Will they be cities under glass, entrenched in distant alien soils? Will they be gleaming metropolises hanging in orbit above our heads, or in the lonely void of space? Will they be hollowed out asteroids, strip-mined for the valuables they hoard? How will we grow food? What will the new era of spacesuits be like? The rovers that carry us around? Will robonauts, advanced robotic machines, perform the most dangerous tasks for us? How will we live in space?
08	"Stopping Armageddon"	January 6, 2009 (2009-01-06)
It sounds like a Hollywood blockbuster: a deadly asteroid is on a collision course with Earth. But in reality, it's only a matter of time before a giant space rock threatens to wipe out civilization. An asteroid took out the dinosaurs sixty-five million years ago. Are we next? This episode analyzes the threat and explores the many ways—from a nuclear bomb to ingenious new technology—that experts are proposing to stop Armageddon.
09	"Another Earth"	January 13, 2009 (2009-01-13)
Could we be unique in the universe or is there another planet similar to earth somewhere in the cosmos? Is it possible that Alpha Centauri, our nearest star, is home to another earth-like planet? Earth sized planets have been hard to find, but indirect methods are coming on line to give scientists a good survey of how many such bodies may be in the universe. How rare would it be to find life on another earth-like planet?
10	"Strangest Things"	January 27, 2009 (2009-01-27)
From stars, galaxies and moons to subatomic particles, black holes and invisible phenomena, discover the most bizarre, mysterious and exotic things in our universe.
11	"Edge of Space"	February 3, 2009 (2009-02-03)
Low Earth Orbit, 120 miles above sea level, is where the majority of space exploration has occurred. This 1,100 mile band around Earth is where—for a cool $20 million—any private citizen can take the vacation of his or her life on the International Space Station. Commercial prospects for LEO are huge; but dangers lurk for any individual willing to travel here. Radiation, cosmic rays, and space debris numbering in the thousands threaten any spacecraft traveling in orbit. It's either the new frontier, or the final frontier, and the possibilities are endless if you are willing to travel to the edge of space exploration.
12	"Cosmic Phenomena"	February 3, 2009 (2009-02-03)
A variety of cosmic events have both helpful and harmful effects on life on Earth. From the beauty of the Aurora Borealis and rainbows to the dangers of UV radiation and cosmic rays, from the miracle of photosynthesis to the thrill of a meteor shower, this episode explores how the effects generated by the sun and other extra-solar sources can literally get under our skin, scramble our technology, make life possible and threaten our existence all at the same time.

Season 4: 2009-2010

#	Title	Original airdate
01	"Death Stars"	August 18, 2009 (2009-08-18)
For most, it's the deadly centerpiece of the film Star Wars. But in truth, real death stars are in the final stage of life before they explode into supernovae and, occasionally, the biggest blast in the universe--the gamma ray burst (GRB). One death star, named WR104, lurks 8,000 light-years from Earth and some believe its GRB arrow is aimed directly at us. A death star galaxy named 3C321 is a terrifying vision of what could one day befall the Milky Way galaxy: a companion galaxy's black hole is hammering it with a constant blast of high-energy particles, wreaking havoc with its celestial bodies. Nearby, Death Stars Eta Carinae and Betelgeuse burn through their fuel supplies as they hurtle toward extinction--and possibly a violent ending that's too close for comfort.
02	"The Day the Moon Was Gone"	August 25, 2009 (2009-08-25)
Without the moon, Earth would be a very different and desolate place today--four hours of sunlight with pitch-black nights, steady 100-mph winds spawning giant hurricanes that last for months, and virtually no complex life forms, much less humans. Safe to say, we probably owe our very existence to the moon. But what if it suddenly disappeared? Solar gravity redirects ocean water that floods coastal spots around the globe. Sea currents shift, resulting in freakish weather patterns. Eventually, earth's axis begins fluctuating wildly and climate change grows more extreme. The poles are tropical jungles and parts of the equator become frigid wastelands. Human evolution starts churning in unpredictable ways or ends completely. Without the moon, the Earth is a very different place.
03	"It Fell From Space"	September 1, 2009 (2009-09-01)
Every year, thousands of objects both natural and manmade plummet through our atmosphere and crash into the Earth. These menacing messengers from the sky provide scientists with amazing insights into the natural, and not so natural, phenomena of the cosmos. From space rocks crashing through homes to cosmic boulders triggering mass extinctions to rocket parts landing on front lawns, explore objects that fall from the heavens, such as asteroids, comets, meteor showers and space debris.
04	"Biggest Blasts"	September 8, 2009 (2009-09-08)
The Universe is full of explosions that both create and destroy. The Chicxulub impact on the Yucatan peninsula, which may have wiped out the dinosaurs 65 million years ago, was two million times more powerful than the largest nuclear bomb ever detonated on Earth. But guess what? That's only good enough for the very bottom of the Biggest Blasts top ten list. This episode works its way up through supernova explosions and gamma ray bursts all the way to the blast that started it all--the Big Bang.
05	"The Hunt for Ringed Planets"	September 15, 2009 (2009-09-15)
They are breathtaking, lethal and a constant source of surprise. The stunning rings of Saturn have mesmerized countless scientists over the centuries. With particles the size of a house shooting at 53,000 miles per hour around the planet, any spacecraft passing through would meet an instant and catastrophic end. Inside the rings is like a NASCAR race--with bumping, jostling and frequent collisions that can cause a massive spin-out. Lesser known are the other planets that have rings--Uranus, Jupiter, Neptune, possibly Pluto and Mars. Even Earth has a ring. Comprised of some 200 satellites in a geosynchronous orbit, it is the only known man-made ring in the universe. But the most remarkable thing about rings is that they contain the story of the birth of our solar system, and entire distant galaxies. Rings are more than a wonder of the universe--they reveal the secrets of our own origins.
06	"10 Ways to Destroy the Earth"	September 22, 2009 (2009-09-22)
Don't try this at home! In this episode, our experts cook up ten ways you could destroy the earth, including: swallowing it with a microscopic black hole; blowing it up with anti-matter; hurling it into the Sun, and switching off gravity. This is a fun way to explore the dangerous physics of the Universe and the properties of the planet we call home.
07	"The Search for Cosmic Clusters"	September 29, 2009 (2009-09-29)
They are the one-stop-shopping places for learning all about the nature and variety of stars in the Universe. They're unique, because in clusters, all the stars were born at about the same time, from the same material and all are at the same approximate distance from Earth. This means we can be sure that any differences among them are due to their true natures and not distorted by different distances from Earth and other factors. In this episode, two kinds of star clusters in the galaxy are explored. "Open Clusters" are young, live in the spiral arms of the galaxy and give us insight into the birth and formation of stars. "Globular Clusters" are old, live in the outskirts of the galaxy and could be nearly as old as the Universe itself. In addition, explore Galaxy clusters to reveal the large-scale structure of the Universe, which is expanding so fast that eventually all other galaxies, except for our own, will literally disappear from our sight.