If alien life is out there, it may be able to exploit more-extreme environments than scientists think, because huge gravitational forces don't seem to pose much of a problem for microbes. Full story
From 220 miles above Earth on the International Space Station, American astronaut Ron Garan certainly has a unique perspective of our home planet. Full story
Author Lily Koppel tells MSNBC’s Richard Lui about the real-life experiences of the wives of astronauts in the 1960s and 1970s as recounted in her new nonfiction book, “The Astronaut Wives Club.”
A NASA spacecraft has been sending back pictures of the Earth from Saturn, offing a glimpse of home from 900 million miles away. NBC’s Brian Williams reports.