Our galaxy's center region is producing gamma rays, but astronomers are still debating whether pulsars or dark matter are the source. Three recent studies tackle the debate head-on.
Tabby's star, otherwise known as the most mysterious star in the galaxy, is dipping drastically in brightness, giving astronomers an opportunity to figure out what has been causing this star's weird behavior.
In just a month, teams will guide this 300-pound, 6-foot-tall humanoid robot in a series of simulated trials as part of NASA’s Space Robotics Challenge.
Astronomers have detected water in the cloud-free skies of "warm Neptune" HAT-P-26b, a clue in the larger mystery of how these planets formed.
A new galaxy survey suggests that a supervoid isn’t responsible for the Cold Spot seen in the cosmic microwave background — the oddity may have a far more ancient origin.
Astronomers have discovered a gravitationally lensed Type Ia supernova that will soon give them a new measure of the universe’s expansion.
Astronomers have transformed star data from the Gaia and Hipparcos missions into a video that predicts stellar motions millions of years from now.
Stellar fireworks are what remains of a centuries-old explosion, the concussive consequence of four stars that came together in a gravitational tussle.
Astronomers have discovered a supermassive black hole not sitting in its customary seat at the center of its galaxy. Gravitational waves from a recent merger may have ejected the black hole.
The discovery of a runaway star in Hubble's image of the Orion Nebula suggests a stellar tussle ejected three stars 540 years ago.
A new study of six young, star-forming galaxies suggests they have less dark matter than expected. But the results may say more about galaxy evolution than about the nature of dark matter.
Winds that charge away from supermassive black holes at a fraction of the speed of light have long been mysterious and even contentious. Now, new evidence sheds light on their origins.
Hankering to discover new solar systems or understand our own? These citizen science projects and public data troves will help you fill your free time.
Scientists are studying 400-year-old data to predict space weather in the coming decades — and it seems that future may hold fewer Northern Lights.
Unlucky stars serve as brilliant but short-lived snacks when they wander too close to supermassive black holes. But one such black hole is still gnawing on its stellar meal after a decade.
Observations of lensed quasars suggest the universe is expanding more quickly than we thought. But they contradict what we know about the young universe.
Astronomers don’t understand how the galaxy’s most massive stars form, but a new simulation sheds light on the process of stellar birth.
Stellar streams are the remains of dwarf galaxies that once orbited the Milky Way. We showcase here stunning images of these galactic ghosts.
Astronomers have observed the motion of distant star clusters to measure our galaxy’s mass. The new estimate places the Milky Way in the lightweight class of galaxies.
Every now and then, the Milky Way’s central, supermassive black hole tears apart a star and flings away some of its innards. Now astronomers think they know how to spot these cosmic spitballs.
The Chandra X-ray Observatory has gazed at a small patch of sky for almost 12 weeks, revealing 1,008 X-ray-emitting sources — most of them supermassive black holes.
An incredible blaze of light discovered more than a year ago still has astronomers baffled as to its cause - and the answer may be contrary to recent headlines.
Scientists have been looking for decades to confirm a weird quantum effect first predicted in 1936. Have they finally found hard evidence for it?
Asteroseismologists delving into the Kepler mission's data trove have found a star that appears to be more spherical than any natural object.
Three teams of astronomers used the SPHERE instrument on the Very Large Telescope to image protoplanetary disks around nearby stars and catch planet formation in action.