Possible sighting of exomoon orbiting distant planet both excites and frustrates, and positive proof eludes scientists.
U.S. spy satellite has launched with help of Russian rocket engine has some U.S. officials concerned
Hubble Space Telescope used updated version of surveyors' technique to make precise measurements of most distant stars. It improved accuracy in measuring the distance to stars 10 times farther away.
T. rex fossil from Montana on its way to Washington, D.C., to be star attraction at Smithsonian museum. It's one of the most complete T. rex skeletons discovered.
New legs for robotic space station crewmember will make it mobile, able to move around both inside and outside
Ice cores retrieved from Greenland ice cap confirm four decades of cleaner air thanks to 1970's U.S. Clean Air Act
Study of historical world temperatures may put nail in the coffin of "natural warming" climate change argument.
The selfie goes from "world-wide" to "orbital" phenomenon, as astronaut posts selfie from the International Space Station.
Almost all of North America will get opportunity to watch spectacular total lunar eclipse. Set your clocks so you can live stream, chat or gasp - go outside!
Little-studied class of synthetic gases, considered 'safer' for Earth's ozone layer, could still be a risk in climate change.
Biofuel crops planted within solar energy farms could bring 'two-for-the-price-of-one' energy bounty.
Flu virus that caused a human pandemic also found in sea otters, suggesting human viruses can infect them.
Automated age-progression software gives uncannily accurate images of how a child will look as they age.
A crater on Mars could once have held a lake of water, analysis shows, and it may have done so more than once.
Micro-sized fuel cell powered by human saliva could lead to tiny implantable medical devices with many uses.
Fossils from the La Brea Tar Pits in Los Angeles show climate's effect on ancient saber-toothed cats and huge, ferocious wolves. What really happened?
Giant pandas and red pandas have a 'shoots and leaves' difference in bamboo diet that allows them to coexist
The 305-million-year-old distant relative of modern spiders had more eyes than its modern descendants.
Flies found capable of maneuvering like a fighter jet to avoid the fly swatter. When threatened, they roll as they turn, five times faster than usual.
Ancient asteroid's impact on Earth dwarfed the better-known 'dinosaur-killer' event, scientists say. The asteroid was as big across as Rhode Island and may have carved out a crater in the Earth's crust around 300 miles wide.
Genetically modified trees will yield more paper while reducing energy and chemicals needed to produce it.
Computer scientists say they think they can predict when a Facebook photo will go viral. Predicting when one of millions of photographs uploaded to Facebook will leap from the crowd and become viral is difficult, but U.
El Niño conditions in the Pacific are not a 'permanent thermostat' that will keep future ocean temperatures stable, researchers say.
Evolutionary explosion of hummingbirds into today's 140 species began when the tiny birds arrived in South America, research shows
Saying Ouch! to a computer-vision system? Better not be faking, researchers say; computers are better than humans at catching false expressions.
Astronomers watch avidly as cloud begins 'death spiral' into the supermassive black hole at the center of our Milky Way galaxy.
European colonization brought collapse to indigenous peoples of Brazil that continues to this day, researchers say, but there's hope for recovery
Photos of Mercury from NASA space probe show surprising evidence of significant volcanic activity scientists say they didn't expect to find.
U.S. satellite to monitor effect of human activity on carbon dioxide emission levels, climate change.
Restaurants hoping for good online reviews of food and service can be tripped up by bad weather encountered by diners on the way in.