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 enigma ties in with the American astronomer Edwin Hubble’s discovery nearly a century ago that the universe is expanding.

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 ...

Since its launch in 1990, Hubble has transformed our understanding of the cosmos. The space telescope revealed a universe teeming with galaxies, stars, and planets instead of what we once saw as empty ...

Numerous stories have been written about the growing swarm of Starlink satellites in low earth orbit (LEO) over the past few years, as astronomers grow increasingly worried about the crafts’ impact on ...