SUNSET: 
Mystery Bursts Give Astronomers a View into Galaxy Halos
Flashes of radio waves — whose exact sources are still a bit of a mystery — are helping astronomers learn about the hot gas that surrounds the Milky Way.
The First Stars Weren’t Born Alone
New evidence suggests the first stars to shine in the universe formed in groups.
Amateur Astronomers Find Glowing Gas Arc Near Andromeda
An arc that glows green thanks to doubly ionized oxygen appears near the Andromeda Galaxy in a photo obtained by amateur astronomers.
White Dwarf Survived 850-year-old Supernova
A supernova that skywatchers in the Far East observed almost 850 years ago has produced the most unusual remnant astronomers have ever found
Astronomers Discover Giant Blinking Star
A red giant star thousands of light-years away "blinked," dimming significantly for seven long years, before returning to normal.
Squid Galaxy Gets in on the Neutrino Game
Astronomers have connected dozens of neutrinos detected by the IceCube Observatory to a nearby galaxy, M77, aka the Squid Galaxy.
Lost Star Catalog of Ancient Times Comes to Light
Technology may have revealed a piece of the long-lost works of Greek astronomer Hipparchus, one of the greatest astronomers of antiquity.
Speeding Cloud Might Come from Recent, Nearby Supernova
Hypervelocity clouds, generally thought to be falling fast into the Milky Way, might have an alternative explanation that places them near us.
Lost Moon Could Solve Saturn’s Riddles
An icy moon torn apart in Saturn's gravitational field some 150 million years ago could explain why the planet's rings are so young and a host of other puzzles.
Did the Dinosaur-killing Asteroid Have a Sidekick?
The asteroid that wiped out the dinosaurs 66 million years ago might not have arrived alone.
Dusty Disk Discovered in the Twins’ Foot
A careful study of observations spanning decades has revealed that a star in Gemini is regularly eclipsed by a disk-shrouded companion.
Webb Telescope Shatters Distance Records, Challenges Astronomers
Distant galaxies in Webb images suggest we need to rethink star and galaxy evolution in the early universe.
Black Widow Pulsar Sets Mass Record
A pulsar has devoured enough of its stellar companion to grab the title for most massive known neutron star.
Dark Matter Remains Elusive – For Now
The first run of a new dark matter experiment turns up nothing — but that still tells us something.
A Strange White Dwarf with a Chaotic Past
New observations show that both rocky and icy worlds fell onto a white dwarf, indicating past orbital chaos in the system.
Where Did Earth’s Trojans Go? Ask the Moon
Why doesn't Earth have Trojan asteroids of its own? Large impacts in the early years of the solar system may be to blame.
Cocoons Around Dying Stars Could Explain New Type of Stellar Explosions
A recently discovered type of stellar explosion might fit right in among the spectrum from regular supernovae to massive gamma-ray bursts.
Hundreds of Thousands of Stars Reveal the Milky Way’s “Teenage” Years
A census of hundreds of thousands of subgiant stars in our galaxy provides a window into the Milky Way's early history.
Fast Radio Burst's Unlikely Home Puzzles Astronomers
Astronomers have found a fast radio burst — presumably a flash from a young stellar remnant — amongst the ancient stars of a globular cluster, challenging ideas about what produces these enigmatic flashes.
How Galaxies Lose Their Dark Matter
A careful study of cosmological simulations shows that dark matter–less galaxies aren't impossible — just really rare.