The smaller, intermediate mass black hole was likely derived from the Sausage Galaxy, which collided with the Milky Way 10 ...

Astronomers tallying up all the normal matter—stars, galaxies and gas—in the universe today have come up embarrassingly short ...

Every galaxy is thought to form at the center of a dark matter halo. Stars are formed when gravity within dark matter halos draws in gas, but astrophysicists don't know whether star-free dark matter ...

Unlike typical ellipticals, this one holds a gaseous halo with no visible stars, puzzling astronomers and hinting at unknown galactic processes far from Earth. Though separated by 2 billion light ...