It's well established that the universe is expanding, but there's serious disagreement among scientists over how fast it's happening.

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

Most of the universe is slipping away from the Milky Way, carried outward as space itself expands. Yet one giant neighbor is bucking the trend, racing straight at us while almost every other major ...

Few people have had as many natural endowments or achievements to feel proud of as Edwin Hubble, the astronomer for whom the Hubble Space Telescope was named. Hubble was a gifted athlete. As writer ...

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.

Astronomers suspect the heart of the Milky Way may be hiding a big secret: a rapidly spinning, highly magnetic, neutron ...

Astronomers may finally understand why planets orbiting two suns, the real-world equivalents of the "Star Wars" planet ...

What we know so far: Stars, like all living organisms, age according to predictable physical laws – or so astronomers once thought. Yet scattered throughout the Milky Way's oldest star clusters are ...

A new radio survey reveals that the Milky Way’s magnetic field is intricate, widespread, and deeply connected to how the galaxy is organized.

Some stars appear to defy time itself. Nestled within ancient star clusters, they shine bluer and brighter than their neighbors, looking far younger than their true age. Known as blue straggler stars, ...

Add Yahoo as a preferred source to see more of our stories on Google. This image is the sum of 86 observations added together, representing over three million seconds of Chandra observing time. It ...

Astronomers have produced the most detailed map yet of dark matter, revealing the invisible framework that shaped the Universe long before stars and galaxies formed. Using powerful new observations ...