Explore astronomy, from the latest trip to the International Space Station to alien planets outside our solar system.
Video: NBC space expert James Oberg discusses the next phase in U.S. space exploration after NASA retires the shuttle program in June.
Maintenance and system checks means it will be at least two days until Endeavour is cleared to launch again.
Who named the shuttle Endeavour? How much did it cost to build? How did it help put the 'international' in International Space Station?
Striking photos taken on the eve of space shuttle Endeavour's final launch show a barrage of lightning that did not damage the spacecraft.
Forecasters said there was a 70 percent chance that weather conditions would be suitable for launch.
The wife of Endeavour's commander makes her first public appearance since being shot in January.
Six old space hands fly Endeavour one last time to deliver parts and a science experiment to the International Space Station.
The launch of NASA's space shuttle Endeavour is expected to draw up an enormous crowd to Florida's Space Coast to catch what will be the fleet's next-to-last flight before the 30-year-old shuttle program retires for good.
Endeavour was named after Captain James Cook's infamous exploring ship from the 18th century.
Mark Kelly, husband of U.S. Representative Gabrielle Giffords, a Democrat recovering from a near-fatal shooting, commands the Endeavour crew.
American businessman Dennis Tito's mission in 2001 as the first space tourist has had a lasting impact, inspiring a range of private spaceflight investment and activity.
NASA mission managers cleared Endeavour for launch this morning after meeting to review any concerns.
New device can help scientists detect dark matter particles that give hints to where larger masses of dark matter are hiding in the universe.
Budget cuts have forced SETI to suspend operations of its alien-hunting Allen Telescope Array, for now.
The recovering Congresswoman from Arizona is making her first trip away from a hospital since the Jan. 8 shootings.
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