Japan's space agency says communication has failed with a newly launched, innovative satellite with X-ray telescopes meant to study black holes and other space mysteries.
Three new crew members have joined the International Space Station, including a US grandfather who is poised to enter the record books during his time there, NASA said.
NASA said it will test the effects of a large fire in space by setting off a blaze inside an orbiting unmanned space craft.
Europe and Russia are set to launch an unmanned spacecraft Monday to smell Mars' atmosphere for gassy evidence that life once existed on the Red Planet, or may do so still.
After spending nearly a year in space, astronaut Scott Kelly is hanging up his spacesuit.
NASA's next Mars mission is still alive.
US astronaut Scott Kelly and Russian cosmonaut Mikhail Kornienko returned to Earth Wednesday after spending almost a year in space in a ground-breaking experiment foreshadowing a potential manned mission to Mars.
Chinese scientists have unveiled three separate projects to investigate gravitational waves, state media said Wednesday, days after earthshaking US discoveries that confirmed Einstein's century-old predictions.
Your best guess is that the landscape is as inhospitable as it gets: An irregular range of sharp boulders and loose rubble piles strewn among jagged crevasses and deep troughs of dust. But then again, it's just a guess because ...
Luxembourg positioned itself Wednesday to pioneer the potentially lucrative business of mining asteroids in space for precious metals such as gold, platinum and tungsten.