SUNSET: 
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.
Citizen Scientists Find 1,000+ Asteroids Photobombing Hubble Images
The combined power of citizen science and machine learning have led to the discovery of more than 1,000 new asteroids in archival images taken by the Hubble Space Telescope.
Does the Andromeda Galaxy Harbor a Mid-weight Black Hole?
New observations suggest a black hole 100,000 times the mass of the Sun lurks in the center of a globular cluster of the Andromeda Galaxy.
Stellar Streams Are Revealing Their Secrets
A detailed study of 12 streams of stars swirling in and around the Milky Way will ultimately help shed light on our galaxy's dark matter halo.
Dwarf Galaxies Shed Light on Black Hole Origins
Astronomers are searching nearby dwarf galaxies for the ancient origins of supermassive black holes.
Stellar Remnant at the Core of Mysterious Flash Dubbed "The Cow"
Astronomers have identified the origin of a mysterious flash that occurred three years ago.
Astronomers Find Confounding Cone Shape in Cluster Collision
Galaxy clusters take eons to collide. Now, astronomers have caught a pair of merging clusters in an in-between stage never seen before.
Nearest Supermassive Black Hole Pair Discovered
Astronomers have observed a pair of supermassive black holes set to collide in 250 million years.
New Observations Challenge Popular Radio Burst Model
Strange behavior caught by two radio observatories may send theorists back to the drawing board.
