As more robots and people travel to the moon in coming years, some researchers believe it's time to set a lunar time standard. NASA Johnson hide caption
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The International Space Station depends on a mix of U.S. and Russian parts. "I hope we can hold it together as long as we can," says former NASA astronaut Scott Kelly. NASA hide caption
Russia's war in Ukraine is threatening an outpost of cooperation in space
This undated artist rendering from the European Space Agency, shows the European-Russian ExoMars rover. European Space Agency handout/AP hide caption
The European spacecraft known as Gaia has unveiled this new view of the Milky Way. ESA/Gaia/DPAC hide caption
You Are Here: Scientists Unveil Precise Map Of More Than A Billion Stars
Visitors sit beside a model of China's Tiangong-1 space station in 2010, at the 8th China International Aviation and Aerospace Exhibition in Zhuhai in southern China's Guangdong Province. As forecast, China's defunct Tiangong 1 space station re-entered Earth's atmosphere Sunday. Kin Cheung/AP hide caption
This satellite photograph depicts the wildfire raging in Greenland, as seen from space last week. NASA Earth Observatory hide caption
NASA has released this image of a section of Mars' surface where the European Space Agency's lander is believed to have met its end. NASA/JPL-Caltech/MSSS hide caption
A visualization shows what the European Space Agency hopes Schiaparelli's Mars landing looks like. The probe will be making its six-minute descent through the atmosphere on Wednesday. M.Thiebaut/ESA-ATG medialab hide caption
A full-size model of the ExoMars entry, descent and landing module Schiaparelli, with its parachute deployed, was on display in the Netherlands in April. The actual lander is en route to the surface of Mars and set to arrive on Wednesday. ESA hide caption
Photos taken on Friday, from more than a mile and a half from the comet, show Philae's three-foot-wide body and two of its three legs. The April 2015 image on the top right shows the comet overall, with the approximate location of Philae marked with a red dot. Main image and lander inset: ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA; context: ESA/Rosetta/ NavCam hide caption
Ellen Stofan (from left), chief scientist of NASA, and astronauts Samantha Cristoforetti, Serena Auñón and Cady Coleman. Jun Tsuboike/NPR hide caption
The Philae lander beamed back images showing one of its three feet on the surface of Comet 67P/Churyumov-Gerasimenko. This photo is compiled from two images. ESA/Rosetta/Philae/CIVA hide caption
A visualization of the polarization of the Cosmic Microwave Background, or CMB, as detected by ESA's Planck satellite over the entire sky. ESA and the Planck Collaboration hide caption
Rosetta, the European Space Agency's cometary probe with NASA contributions, is seen in an undated artist's rendering. NASA/Reuters/Landov hide caption
Rosetta and Philae in an artist's rendition of the spacecraft's comet encounter. European Space Agency hide caption
An artist's rendition of the GOCE satellite shows the craft in its orbit around Earth. After four years of studying oceans and gravity fields, GOCE re-entered the atmosphere over the Southern Atlantic Ocean Sunday night. ESA /AOES Medialab hide caption
Technicians prepare the Planck satellite for hydrazine fueling in April 2009. P. Baudon/ESA-CNES-Arianespace hide caption
An artist's imagination Saturn's orange moon Titan. Steven Hobbs/NASA hide caption