Mission STS-129 to the International Space Station begins.
Astronaut Jeff Williams, aboard the International Space Station 220 miles above Earth, is taking your questions. Post a video response with your question at ReelNASA on YouTube. Williams' schedule will not allow him to answer many questions, but he will attempt to answer a few each week.
NASA's long-running Mars rover Spirit will begin critical drives for escaping a sand trap.
NASA Administrator Charles Bolden and Secretary of Education Arne Duncan hosted Washington area students for a live discussion with Expedition 21 astronauts aboard the space station.
This footage provides extremely valuable engineering data, and imagery of the recovery sequence in rarely-seen detail.
The Ares I-X rocket lifted off from Kennedy Space Center to begin its flight test.
The Ares I-X flight test mission offers an in-depth exam for its development team.
The Ares I-X rocket rolled out to Launch Pad 39B at NASA's Kennedy Space Center.