The Andromeda galaxy will eat up the Milky Way in four billion years. Here are images to remember it by.
An excess of high-energy light may come from "undetected" dead stars, not dark matter, according to a new study.
“It seems different to all types of astronomical objects we know, it may be a new type of object,” said the study's lead author.
A new study has "cast serious doubt" on a ubiquitous galactic feature that may require exotic physics to explain.
The newly discovered signals flash for weeks at a time and can stop in just a day, a pattern that has no clear explanation.
Palomar 5, a cluster flanked with giant star tails, will be completely usurped by black holes in one billion years, scientists predict.
Hundreds of images captured over 20 years were compiled to create the spectacular panorama.
A new Odd Radio Circle (ORC) appears to span a million light years, and contains a clue that could explain these ghostly structures.
The highly energetic gamma ray was more powerful than any particle accelerator on Earth, hinting at the existence of cosmic super-accelerators called PeVatrons.
An unexplained glow at the center of the Milky Way that has puzzled scientists for years might just be the aftermath of dark matter annihilation events.
We’ve always thought of supermassive black holes as stationary objects sitting tight while everything swirls around them. Until now.