Will the real ET be little green men or little green bacteria? SETI Institute Senior Astronomer Seth Shostak theorizes what our first alien encounter might be like.
NASA's Spitzer Telescope discovered evidence that a high-speed collision between two planets happened thousands of years ago. Scientists think this type of collision is how planets, like the Earth, are formed.
Mars time and Earth time are so similar, scientists working on the Phoenix Mars Lander mission are in a constant state of jet lag. Space producer Dave Mosher finds out how they're coping with the ever changing clock.
Have you ever wondered if the human race could survive on Mars? Discovery Channel Space Producer Dave Mosher gets the answer to this question and more.
Methane, a building block for life, has been discovered for the first time on a planet 63 light years away from Earth. James Williams looks into what the big deal is.
After a three-billion mile journey into the outer reaches of the solar system, the Stardust spacecraft has landed at it's permanent home. Dave Mosher brings us up to speed. Kasey-Dee Gardner produces.
NASA just smashed the LCROSS and spent Centaur rocket into the moon in a search for water on the lunar surface. Even better - the impact was captured on video! Did it live up to the hype? James WIlliams takes a look.
NASA's Spitzer Space Telescope discovered evidence that a high-speed collision between two planets happened thousands of years ago. Scientists think this type of collision is how planets, like the Earth, are formed.
The Hubble Space Telescope wouldn't work without Jill McGuire. That's because she and her team help build the tools that keep it running. She talks to Jorge Ribas about her cool job.
A thousand years of observations reveal that there are stars that move in the sky and follow patterns, showing that the Earth is part of a solar system of planets separate from the fixed stars.
Edwin Hubble determines the distance to many nearby galaxies and discovers that the farther they are from us, the faster they are flying away from us. His calculations prove that the universe is expanding.
Astronomers find a host of extrasolar planets as a result of improved telescope technology and prove that other solar systems exist, although none as yet resembles our own. Astronomers are able to detect extrasolar planets by measuring gravitatio ...
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