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Should NASA pay companies to fly astronauts to the International Space Station?
NASA launches a new spacecraft to study Mars's atmosphere
A new study reveals that a skull found in Tibet is the oldest big cat fossil ever unearthed
The eastern population of Steller sea lions comes off the threatened list
Scientists explain why people often blame others when things don’t work out
Halfway through the major storm season, the U.S. has yet to experience a hurricane
NASA will study twin brothers to learn about how space affects the body
At a conference in Lindau, Germany, Nobel Prize winners and other scientists meet to share ideas
The solar-powered airplane Solar Impulse completes its historic cross-country flight
The history of women in space began 50 years ago—and continues to this day
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