04 March 2011, 11:00 AM ET
The Air Force's second X-37B may well be testing out equipment for U.S. spy satellites, expert says.
04 March 2011, 04:48 AM ET
The 12 astronauts on shuttle Discovery and the space station have a busy unpacking day ahead.
03 March 2011, 07:23 PM ET
President Barack Obama called the 12 astronauts on the International Space Station today. Obama marked the final flight of shuttle Discovery and urged astronauts to unpack a space robot.
03 March 2011, 02:35 PM ET
The Robonaut-1 balloon took this video from about 100,000 feet up, just after NASA's space shuttle Discovery launched on Feb. 24, 2011. The wafting vapor trail Discovery left behind as it streaked into space is visible.
03 March 2011, 01:59 PM ET
Discovery's astronauts will have some well-deserved time off today.
02 March 2011, 07:08 PM ET
The U.S. military's super-secret X-37B space plane is all set to launch on its second mission Friday, though what it will be doing on orbit remains a mystery. The X-37B will launch from Cape Canaveral on an Atlas 5 rocket.
02 March 2011, 05:55 PM ET
Two Discovery astronauts tackled their final spacewalk outside the International Space Station today.
02 March 2011, 09:26 AM ET
A minor leak was detected on astronaut Steve Bowen's spacesuit.
01 March 2011, 03:33 PM ET
Discovery shuttle astronauts are trying new eyeglasses to ease eyestrain on aging eyes. Discovery delivered Superfocus glasses, an alternative to bifocals, to the International Space Station.
01 March 2011, 12:48 PM ET
Due to safety concerns, a proposed photo session at the International Space Station is off.
01 March 2011, 10:19 AM ET
Discovery shuttle astronauts delivered the Leonardo module to the space station today.
01 March 2011, 06:00 AM ET
Discovery shuttle astronauts will install a much-needed storage module at the space station today.
28 February 2011, 06:15 PM ET
Shuttle astronauts completed the first spacewalk of Discovery's STS-133 mission.
28 February 2011, 06:04 PM ET
Two astronauts working outside the International Space Station today collected an unusual souvenir of their spacewalk: a bottle full of space.
28 February 2011, 11:00 AM ET
Two astronauts are tackling a spacewalk outside of the International Space Station today.
27 February 2011, 05:53 PM ET
The astronauts reflect on the significance of Discovery's historic last mission.
27 February 2011, 09:01 AM ET
Discovery's six astronauts are gearing up for a busy day of unpacking.
26 February 2011, 06:32 PM ET
For the first time ever, spaceships from four different space agencies are linked in orbit at the same time.
26 February 2011, 02:23 PM ET
Discovery will stay docked to the orbiting lab for seven days.
26 February 2011, 06:41 AM ET
Shuttle Discovery will make its final arrival at the International Space Station today.
25 February 2011, 08:49 PM ET
A student balloon took dramatic photos of shuttle Discovery launching on its final flight Feb. 24. The balloon captured the photos from the edge of space.
25 February 2011, 08:10 PM ET
A debris strike on the space shuttle Discovery during its Thursday launch poses no threat to the spacecraft or its astronaut crew, NASA officials say.
25 February 2011, 03:00 PM ET
A bicycle crash may have kept astronaut Tim Kopra stuck on Earth, but he's with shuttle Discovery's crew in spirit.
25 February 2011, 10:41 AM ET
What will happen to space shuttle Discovery's flight if there is a partial government shutdown?
25 February 2011, 09:00 AM ET
Reminiscing with a former astronaut from the space shuttle Discovery's maiden voyage.
25 February 2011, 09:00 AM ET
Engineers who helped build the space shuttle Discovery now say goodbye to the space workhorse.
24 February 2011, 06:12 PM ET
The Space Shuttle Discovery and its STS-133 crew blast off from Kennedy Space Center at 4:50pm EST, February 24, 2011, for the shuttle's final mission to the ISS before retirement.
24 February 2011, 05:52 PM ET
See photos from Space shuttle Discovery's final launch into space on Feb. 24, 2011.
24 February 2011, 04:57 PM ET
Engineers are trying to fix a damaged space shuttle heat shield tile in time for today's launch
24 February 2011, 04:53 PM ET
NASA's space shuttle Discovery launched on one final mission Feb. 24.
24 February 2011, 06:33 AM ET
The space shuttle Discovery is set to launch on its final flight today.
23 February 2011, 06:57 PM ET
High-schoolers have helped build a balloon camera to photograph space shuttle Discovery's launch.
23 February 2011, 06:26 PM ET
NASA's space shuttles aren't the gleaming spaceships you might think.
23 February 2011, 05:04 PM ET
Life on the International Space Station may get cushier when a robot butler called Robonaut 2 arrives. NASA's space shuttle Discovery will deliver Robonaut 2 to the station this week.
23 February 2011, 01:18 PM ET
NASA says the space shuttle Discovery is "ready to fly" its final mission.
23 February 2011, 07:30 AM ET
The last astronaut crew of space shuttle Discovery are all veteran spaceflyers.