Hypervelocity stars (HVSs) were first theorized to exist in the late 1980s. In 2005, the first discoveries were confirmed.

Scientists are keen to get to the bottom of the dark matter puzzle because this phenomenon accounts for the vast majority of the "stuff" in the universe — about 85%, in fact. That means everything we ...

One of the most extensively studied stellar streams within the galactic halo of the Milky Way is the GD-1 stellar stream. It is known for its long, thin structure and distinctive features.

When you point a telescope toward the Pegasus constellation, you can discover a scene where the Milky Way stars and distant galaxies unfold. NGC 7814, located in the center, occupies an area that ...

Scientists used changes in the supermassive black hole M87*'s accretion disk to infer its orientation, size and turbulence ...

Astronomers in the U.S. and Canada have revealed that the circumgalactic medium—a vast, complex halo of gas surrounding ... forming galaxies like the Milky Way that contributes to recycling ...

After decades of study, scientists sound genuinely optimistic about the possibility of detecting primordial black holes, which might explain dark matter.

Having previously observed the bright halo of matter whipping around the ... by 30 degrees from one year to the next. Related: The Milky Way's supermassive black hole is spinning incredibly ...

There's just one problem: While some black holes are fairly obvious thanks to the bright halo of matter surrounding ... 2 stars dancing around the Milky Way's black hole — and they could point ...