An arc that glows green thanks to doubly ionized oxygen appears near the Andromeda Galaxy in a photo obtained by amateur astronomers.
Hypervelocity clouds, generally thought to be falling fast into the Milky Way, might have an alternative explanation that places them near us.
The asteroid that wiped out the dinosaurs 66 million years ago might not have arrived alone.
Distant galaxies in Webb images suggest we need to rethink star and galaxy evolution in the early universe.
A recently discovered type of stellar explosion might fit right in among the spectrum from regular supernovae to massive gamma-ray bursts.
A census of hundreds of thousands of subgiant stars in our galaxy provides a window into the Milky Way's early history.
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.
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.
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.