23 December 2013, 10:54 AM ET
A malfunctioning cooling pump was removed in the first of a multiple space walk repair mission for ISS astronauts. Astronauts Rick Mastracchio and Mike Hopkins completed Spacewalk #1 on Dec. 21, 2013.
23 December 2013, 09:35 AM ET
See stunning photos of the cloud-covered Titan from NASA's Cassini spacecraft.
22 December 2013, 01:17 AM ET
NASA pushed the second of three planned holiday spacewalks by 24 hours after noticing an issue with the spacesuit of Rick Mastracchio, who ventured outside the orbiting lab with fellow NASA astronaut Mike Hopkins Saturday.
21 December 2013, 12:35 PM ET
Two astronauts working speedily outside the International Space Station removed a faulty pump module ahead of schedule, potentially negating the need for a planned Christmas Day spacewalk as they work to repair the outpost’s critical cooling system.
21 December 2013, 11:00 AM ET
Astronauts will perform two or three spacewalks to repair a problem with the International Space Station's cooling system, scheduled for Dec. 21, 23 and 25, 2013.
21 December 2013, 07:14 AM ET
Two NASA astronauts have begun their first of three quickly planned spacewalks to fix a problem with the International Space Station's vital cooling system.
21 December 2013, 12:09 AM ET
What was your favorite space news story of the last week?
20 December 2013, 11:52 PM ET
From amazing photos of the Gaia galaxy-mapping spacecraft's launch to an amazing Hubble image of a celestial "Christmas wreath," don't miss these amazing space images of the week for Dec. 21, 2013.
20 December 2013, 07:00 PM ET
On Saturday (Dec. 21), two NASA astronauts will venture outside the International Space Station to perform the first of potentially three urgent spacewalks to fix the vital cooling system on the orbiting outpost. You can watch it live online.
20 December 2013, 10:46 AM ET
In a milestone for robot-human relations, the talking Japanese robot Kirobo had its first conversation with an astronaut in space.
20 December 2013, 10:24 AM ET
It is one of the most famous photos ever taken — the Earth rising over the moon's horizon as seen firsthand by the 1968 Apollo 8 crew. And yet, more than four decades later, details about how the photo was captured are still being uncovered.
20 December 2013, 10:18 AM ET
In a first for robot-human relations, Japanese astronaut Koichi Wakata chatted with the talking robot Kirobo aboard in the International Space Station on Dec. 6.
20 December 2013, 10:12 AM ET
In December 1968, the Apollo 8 crew became the first humans to experience an Earthrise from the lunar orbit. This visualization is based off of the actual photos and satellite imagery. Narrated by Andrew Chaikin, author of 'A Man on the Moon'.
20 December 2013, 09:48 AM ET
This aircraft is undergoing a test in a wind tunnel at Langley.
19 December 2013, 04:59 PM ET
Soyuz VS06, with Gaia space observatory, lifted off from Europe's Spaceport, French Guiana, on Dec. 29, 2013, as seen in this spectacular space wallpaper.
19 December 2013, 04:36 PM ET
The NEOWISE spacecraft has taken its first set of test images since being reactivated in September after a 2.5-year-long hibernation. NEOWISE will resume its hunt for potentially dangerous asteroids, some of which could be targets for human exploration.
19 December 2013, 04:18 PM ET
LEGO will launch its 2014 toy line with a fan-created model of NASA's Mars Curiosity rover. The Danish toy company announced on Wednesday (Dec. 18) that its new "NASA Mars Science Laboratory Curiosity Rover" building brick set will go on sale Jan 1.
19 December 2013, 03:45 PM ET
Astronauts preparing to spacewalk outside the International Space Station are outfitting their spacesuits with an unusual device: a makeshift snorkel.
Primary Section: spaceflight
19 December 2013, 02:15 PM ET
A new way to weigh the mass of distant alien worlds could help reveal key details about how friendly they may be to life, researchers say.
19 December 2013, 02:12 PM ET
Space rocks and a Space rock star consumed much of the viewing this year. Find out which one took the top spot for 2013.
19 December 2013, 12:06 PM ET
European Space Agency's Gaia spacecraft launched from Kourou, French Guiana on Dec. 19, 2013 aboard a Russian Soyuz-Fregat rocket. The spacecraft will deliver the most comprehensive map of the Milky Way to date.
19 December 2013, 09:44 AM ET
An astronaut and a cosmonaut shake hands during the STS-71 mission.
19 December 2013, 07:00 AM ET
The Mars One colonization mission plans to bring live video of the surface of Mars to Earth via a privately built communications satellite and lander to launch as part of an unmanned mission in 2018.
19 December 2013, 07:00 AM ET
Europe's Gaia spacecraft lifted off from French Guiana Thursday, carried aloft by a Russian Soyuz-Fregat rocket. Gaia is on its way to a gravitationally stable point about 930,000 miles from Earth, which it should reach in three weeks.
19 December 2013, 01:31 AM ET
Here are amazing photos featuring the top 10 space robot "selfies."
18 December 2013, 06:50 PM ET
Repairing a problem with the International Space Station's vital cooling system will require at least two if not three spacewalks, NASA officials said today (Dec. 18). The spacewalks are scheduled for Dec. 21, 23 and 25.
18 December 2013, 06:50 PM ET
Lead U.S. Spacewalk Officer Allison Bolinger explains what the ISS astronauts will be doing over 3 spacewalks to repair cooling system. A pump module needs to be replaced.
18 December 2013, 01:24 PM ET
Had the momentum of the 1960s been maintained over the next 40 years, there would be footprints on Mars by now. But after Apollo, the political impetus for manned spaceflight was lost.
18 December 2013, 12:33 PM ET
An astronaut prepares for STS-38 by training underwater for EVAs.
18 December 2013, 11:32 AM ET
Space shuttle Independence has a new parking spot. Space Center Houston's full-size space shuttle replica embarked on a short trip on Tuesday (Dec. 17) as it was moved from its outdoor display location of more than a year.
18 December 2013, 07:01 AM ET
This year, some spacecraft never made it into orbit, while others completed their missions before quietly turning off. Still more had their time working in space cut short. We at SPACE.com wish to honor the spacecraft we lost in 2013.
17 December 2013, 07:06 PM ET
NASA has decided that three spacewalks — one each on Dec. 21, 23 and 25 — will be necessary to replace a faulty pump module on the station. As a result, the planned launch of the unmanned Cygnus spacecraft will occur in mid-January at the earliest.