U.S. astronaut Peggy Whitson, the Mission commander, who has a doctorate in biochemistry, is taking the necklace that she ...

The findings provide the strongest evidence yet that asteroids may have planted the seeds of life on Earth and that these ingredients were mingling with water almost immediately.

But how well do you really know our planetary neighbor? This quiz of 15 questions will test your knowledge of Mars' size, surface and history, as well as scientists' attempts to study it. Remember to ...