SUNSET: 
Comets Have (Ultraviolet) Aurora, Too
Observations from the European Space Agency’s Rosetta spacecraft show that Comet 67P/Churyumov-Gerasimenko has its own aurora.
Sun’s Activity Cycle Is Stabilizing
Solar Cycle 25 is here, and forecasts suggest the next decade of the Sun’s activity will mimic the last one — halting a 40-year trend.
Hubble Images Reveal Dark Matter Problem
Astronomers studying Hubble Space Telescope images of massive galaxy clusters have uncovered a potential problem with dark matter.
Astronomers Map Andromeda’s Halo
Astronomers have observed 43 quasars in back of our sister galaxy, Andromeda, using the distant beacons to map its halo of hot gas.
See the Invisible: A Gallery of Magnetic Fields
Magnetic fields affect everything from star formation to galaxy evolution. View a gallery of images that show magnetism's role.
Hubble Captures Comet NEOWISE
The Hubble Space Telescope imaged the famous comet on August 8th.
"Dead Ringer" for the Milky Way Found in Early Universe
A cosmic magnifying glass has revealed a Milky Way-like galaxy in the early universe that doesn’t conform to cosmologists’ expectations.
Asteroid Ceres: An Ocean World
Scientists have thought that the largest main-belt asteroid, Ceres, had an ancient ocean beneath its surface. But new data from the Dawn spacecraft show the underground ocean might still be there.
Neutron Star Found in Supernova 1987A
After decades of searching, astronomers have finally found the collapsed core of the nearest supernova recorded in recent history.
Remains of an Ancient Star Cluster Revealed
A torn-apart globular cluster provides a window into the Milky Way's past.
First Image of a Young Sun and Two Giant Planets
For the first time, astronomers have imaged multiple planets orbiting a Sun-like star.
New 3D Map of the Universe — and a Growing Cosmological Debate
The Sloan Digital Sky Survey has released a new map of the universe — and the results confirm ongoing tension over the expansion rate of the universe.
Citizen Scientists Help Discover “Weird” Brown Dwarfs
Astronomers and citizen scientists have found two would-be stars lacking heavy elements. They’re most likely ancient survivors of our galaxy’s earliest days.
New Launch Date for James Webb Space Telescope
NASA has delayed its beleaguered James Webb Space Telescope to October 2021, in part due to the COVID-19 pandemic.
European Solar Orbiter Takes Closest-ever Images of the Sun
The first images to be released from the European Space Agency’s Sun-imaging spacecraft show intriguing “campfires” that could help explain a solar mystery.
New Evidence for Nanoflares?
Astronomers have spotted weak bursts of low-frequency radio emission coming from all over the Sun.
Three Nearby Exoplanets to Explore
A trio of nearby exoplanets make tempting new targets for next-gen telescopes.
First All-sky Map from eRosita
The first all-sky X-ray map to be released in 30 years reveals new wonders of the hot and energetic universe.
Astronomers Discover a Newborn Magnetar and a New Cosmic Beat
This week, astronomers announce a newborn magnetar and a fast radio burst that's bursting to a beat.
Astronomers Discover Huge Circular Arc Near the Big Dipper
The 30-degree circular arc is likely a shock front expanding from a star that exploded some 100,000 years ago.
