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

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

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A new composite image of the Andromeda Galaxy is offering an unprecedented view of our closest spiral galactic neighbor. Composed by NASA and international space partners, the image combines data from ...

A new composite image of the Andromeda Galaxy is offering an unprecedented view of our closest spiral galactic neighbor. Composed by NASA and international space partners, the image combines data from ...

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.

A new photo taken by the world's most powerful telescope shows a 6-quadrillion-kilometre span of our galaxy.

In A Nutshell A massive star in the Andromeda Galaxy faded by more than 10,000 times over a decade and vanished from view, ...

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 ...

A vast, flat sheet of dark matter may solve the long-standing mystery of why our neighboring galaxy Andromeda is speeding toward us while our other neighbors are moving away from us.