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 ...

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

For years, astronomers have observed the strange motion of Andromeda, the Milky Way’s closest large galactic neighbor. While ...

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

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

The vast "sheet" of dark matter could explain why almost all of our galactic neighbors are running away from us.

The solution to a persistent astronomical question that has puzzled scientists for half a century has emerged not from direct observation, but from the computing power of sophisticated computer ...

New observations from the Hubble Space Telescope have revealed surprising activity inside the Andromeda galaxy. The data ...

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

One of the most stubborn issues in cosmology today concerns the universe's rate of expansion. Scientists know it's expanding, but defining the rate of that expansion is challenging. The rate of ...

The protostar is launching the longest outburst ever seen at 32 light-years long. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Breaking space ...

Lensing in action: A montage of eight time-delay gravitational lens systems. There is an entire galaxy at the centre of each image, and the bright points in rings around them are gravitationally ...