For nearly a century, astronomers have known that the universe is expanding. Most galaxies are carried outward with the flow ...

A vast, flat sheet of dark matter may solve the long-standing mystery of why our neighboring galaxy Andromeda is speeding ...

The team discovered the star by analyzing archival data from NASA’s NEOWISE mission. They used a prediction from the 1970s ...

If confirmed, this disappearing act might provide the closest and best observational evidence for the birth of a black hole ...

A massive star in the nearby Andromeda galaxy has simply disappeared. Some astronomers believe that it's collapsed in on ...

DS1, collapsed into a black hole without exploding, revealing how stars die in silent “failed supernova” events.

Andromeda is also a flattened spiral like the Milky Way, but it's twice as large — 220,000 light-years across versus 105,000 for the Milky Way — and crammed with a trillion suns. Can you even begin to ...

Astronomers tracked a star in Andromeda as it dimmed and vanished without the usual fiery explosion, offering rare clues to ...

It turns out that looming collision between our Milky Way and Andromeda galaxies might not happen after all. Astronomers reported Monday that the probability of the two spiral galaxies colliding is ...

Astronomers discover a star in Andromeda that may have collapsed into a black hole instead of exploding as a supernova.

There has been one other instance of a star mysteriously disappearing, a “failed supernova candidate” dubbed N6946-BH1 that ...

Computer simulations carried out by astronomers from the University of Groningen in collaboration with researchers from Germany, France and Sweden show that most of the (dark) matter beyond the Local ...