A planned spacewalk outside the International Space Station was scrapped because of what NASA called a "medical concern" with an unidentified crew member.

NASA said Thursday that it will bring four astronauts aboard the International Space Station back to Earth more than a month earlier than planned

In the latest study, they discovered that the pups can also understand new names by eavesdropping. Ten gifted dogs — including a Border collie named Basket and a Labrador named Augie — watched their owners hold a new toy and talk to another person about it. Then the pups were told to go to another room and retrieve that specific toy from a pile of many others.

Toddlers can pick up new words just by overhearing conversations. Now, new research suggests that some intelligent dogs can expand their vocabulary in just the same way.

A newly discovered celestial object may be a starless cloud that could change how astronomers understand dark matter.

In a rare move, NASA is cutting a mission aboard the International Space Station short after an astronaut had a medical issue. NASA canceled its first spacewalk of the year because of the health issue. The space agency did not identify the astronaut or the medical issue, citing patient privacy.

Fossils unearthed in Morocco are the first from a little-understood period of human evolution and may be remains of a mysterious human ancestor.

The Hubble Telescope appears as a tiny silhouette during a perfectly timed solar transit captured from Puerto Rico.

From volcanic landscapes to world-class observatories, a journey through the Canary Islands reveals a night sky unlike anything I'd seen before.

Another view from Perseverance shows how windswept Mars' landscape truly is.

Melting ice, thawing permafrost and crumbling fjord walls are just a few of the risks climate change poses for those living and working in Greenland.

The hydrogen cloud is a remnant of the universe's early formation, NASA said in a news release.

WASHINGTON, Jan 6 (Reuters) - Jupiter's moon Europa is on the short list of places in our solar system seen as promising in the search for life beyond Earth, with a large subsurface ocean thought to

The reservoir seen in this image is sometimes referred to as the "eye of Quebec."

Students who participated in the virtual Research Experience for Undergraduates at Purdue reported stronger gains in research skills than in-person summer interns.

Bad news for those hoping interstellar invader 3I/ATLAS is an alien spacecraft as technosignature search turns up empty.

One of the world's rarest whale species is having more babies this year than in some recent seasons, but experts say many more young are needed to help stave off the possibility of extinction. The North Atlantic right whale's population numbers an estimated 384 animals and is slowly rising after several years of decline. Researchers have identified 15 calves this winter, the National Oceanic and Atmospheric Administration said Monday.

Lunar landers from Blue Origin, Firefly Aerospace, Intuitive Machines and Astrobotic are gearing up for moon landing attempts in 2026 as the commercial exploration of deep space expands.

January's full moon is often known as the 'Wolf Moon'.

The Westerlund 2 star cluster is home to some of the Milky Way's brightest stars.

Astronomers are gathering in Phoenix this week for the 247th meeting of the American Astronomical Society (AAS 247), where the latest discoveries from exoplanets, JWST and upcoming space missions will take center stage.

The new findings strengthen the "RNA world" hypothesis that describes how the first life on Earth could have used RNA instead of DNA.

Space debris falling to Earth is a growing threat to aircraft, and experts are trying to reduce the risk.

But as more and more satellites are launched into LEO...the region's getting a bit crowded.

NASA's ESCAPADE Mars probes embarked on a 'loiter' trajectory after launch, and scientists say that extra time in space could have some consequences for the twin spacecraft.

If nonliving materials can produce rich, organized mixtures of organic molecules, then the traditional signs we use to recognize biology may no longer be enough.

SpaceX launched the first mission of 2026 tonight (Jan. 2), sending an Italian Earth-observing satellite to orbit.

The Quadrantids are known for producing bright "fireball" meteors that can outshine the brightest planets

NASA's MAVEN spacecraft, which has orbited Mars since 2014, went quiet abruptly in early December. Efforts to reestablish a connection have been unsuccessful.

From communications outages to a brush with nuclear war, solar events like flares and coronal mass ejections have shaped human history.