SUNSET: 
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.
Twisters in the Cosmic Web
Astronomers have found that the largest structures in the universe spin, making twister-like strings of galaxies and dark matter in the cosmic web.
Dark Energy Survey Catalogs 226 Million Galaxies
The latest release from the Dark Energy Survey catalogs millions of galaxies, mapping the history of galaxy clustering across space and time.
Is the “Unicorn” the Closest Black Hole?
Astronomers again think they have found the black hole nearest to us, just 1,500 light-years away, but the find still needs to be confirmed.
New Distances Support Idea of Dark Matter-less Galaxies
New distances to two dwarf galaxies with unusually spread-out stars support the idea that these galaxies have little to no dark matter.
Tibet Observatory Confirms Existence of Galactic PeVatrons
A Tibetan cosmic-ray observatory has discovered high-energy particle accelerators within our galaxy.
Zodiacal Dust Seen from Earth Might Come from Mars
Much of the solar system’s interplanetary dust — seen as zodiacal light from Earth — might come from Mars.
Star-shredding Black Hole Makes Ghostlike Particle
A single high-energy neutrino may shed light on a star being swallowed by a supermassive black hole some 690 million light-years away.
Astronomers Spot Galaxies Clustering in Early Universe
Astronomers have discovered a cluster of galaxies coming together just 770 million years after the Big Bang.
