On a clear night, the Milky Way and the Andromeda galaxy look like close neighbors. In space, they really are.

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

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

Our Milky Way galaxy may not have a supermassive black hole at its center but rather an enormous clump of mysterious dark ...

Astronomers propose that an ultra-dense clump of exotic dark matter could be masquerading as the powerful object thought to ...

A flat plane of dark matter beyond the Local Group may explain why nearby galaxies move away from us instead of falling ...

A groundbreaking new radio image reveals the Milky Way in more detail than ever before, using low-frequency radio “colors” to map the galaxy’s hidden structures. The image is sharper, deeper, and ...

CAPE CANAVERAL, Fla. — 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 ...

Computer simulations carried out by astronomers from the University of Groningen in collaboration with researchers from ...

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 ...

This idea is called the big bang model—which is an unfortunate name because it brings to mind a cosmos expanding like an ...

From your place inside the Milky Way, you are living within a galaxy that keeps a detailed chemical diary. Every star holds clues about when it formed and what the galaxy was like at the time. Over ...