A sheet of dark matter lying beyond the boundary of the Local Group is responsible for this.

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 ...

For more than a century, astronomers have watched in astonishment as the Andromeda galaxy ignored the grand flow of cosmic ...

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

Astronomers have long known that the Andromeda galaxy, aka Messier 31, a swirling city-state of a trillion stars — plus all the accouterments of gas, dust, dark matter and black holes — is rumbling ...

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 ...

Will the Milky Way and Andromeda galaxies collide in several billion years? The odds have changed with a new study using 100,000 supercomputer simulations. Credit: NASA's Goddard Space Flight Center ...

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Warning: This graphic requires JavaScript. Please enable JavaScript for the best experience. The Andromeda galaxy is the galaxy next door, a very faint, fuzzy thing ...

August has been a month jam-packed with cosmic phenomena visible from Earth – from nebulas to meteor showers to planetary conjunctions. But the month isn't over yet. And now, add to the mix one of the ...