The star used to be one of the brightest star in the neighboring Andromeda galaxy.

A family portrait of the Andromeda galaxy and its orbiting dwarf satellites raises questions about how galaxies evolve.

Astronomers report a supergiant star in the Andromeda Galaxy, M31-2014-DS1, collapsed directly into a black hole without a supernova, confirming predictions of failed stellar explosions.

Their research was guided by a prediction from the 1970s: if a star collapses directly into a black hole, it should briefly ...

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

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

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

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky. M31, the spiral galaxy in Andromeda, with its two companion ...

A massive star in the nearby Andromeda galaxy has simply disappeared. Some astronomers believe that it's collapsed in on itself and formed a black hole.

In the nearby Andromeda Galaxy, a massive star bright enough to stand out for years has gone dark. Not in a blaze of glory.

Andromeda galaxy's mass is similar to the Milky Way's. Scientists used star escape velocity to measure Andromeda's mass. Andromeda contains less dark matter than previously believed. The Milky Way's ...