Asteroid 2017 AG13 unexpectedly whizzed by Earth on Monday. What is NASA doing to prepare?
Sponsored by the National Audubon Society, the annual winter tally offers an opportunity for ordinary citizens to help gather data on bird populations around the globe.
In an astronomical first, the Hubble telescope spies a shadow that appears to betray the presence of a hidden planet.
SpaceX has an ambitious timeline, but a more cautious approach may be necessary, some observers say, given how much is at stake.
Two stars in the binary star system KIC 9832227 may collide sometime in 2022, creating a red nova that would be visible to the naked eye some 1,800 lightyears away.
Two astronauts took a risky spacewalk Friday as the part of a long-term effort to upgrade the batteries on the International Space Station's power grid.
Scientists' new discovery of fossils in 52 million-year-old Patagonian rock shows that the ancestors of many common foods were already around when the Gondwana supercontinent was breaking up.
The Chandra X-Ray Observatory tuned its sensors to information from the early days of the universe, and found a cluster of black holes growing in spurts.
Fast Radio Bursts, or FRBs, have been detected since 2007 but they're really hard to spot. A recent study of the only known repeating FRB has pinned down its origin: a dwarf galaxy 3 billion light years away.
What will these small space rocks tell us about the origins of our solar system?
Researchers have independently replicated NOAA's recalibration of sea surface temperature data to uncover what really happened from 1998 to 2012.
C/2016 U1 NEOWISE, at its brightest the first week of 2017, should be visible with a good pair of binoculars.
NASA announced Ellen Stofan's resignation in a blog post, but hasn't named a successor for the top science job in the agency.
A mission slated for 2020 might reveal more about a hard-to-study phenomenon.