DECam's specialized filter allowed the team to count the number of companion galaxies around the quasar by detecting a very specific type of light they emit, known as Lyman-alpha radiation.

But for the first time, researchers at MIT have managed to unpick this mixture of signals and detect the faint stellar light from stars in galaxies around some of the oldest quasars in the universe.

The largest sample of galaxy groups ever detected has been presented by a team of international astronomers using data from ...

The halo is more extended that astronomers originally thought, and contains enough hydrogen gas to resolve the problem of the ...

The school-bus-sized observatory launched on April 24, 1990 and overcame early setbacks to become one of the most ...

Quasar J0742+2704 (center) became the subject of astronomers' interest after it was discovered to have a newborn jet blasting from the disk around its ... with other galaxies are what funnel ...

and chaos in the space around these black holes. Over time, it became clear that quasars weren’t just isolated beacons—they were deeply connected to their host galaxies and the universe’s ...

Hubble dimmed quasar 3C 273’s glare to reveal ghostly blobs and filaments near its core—evidence of galaxy cannibalism and ...

Discover the power of black holes and their jets, and how they impact the formation of stars and potentially habitable worlds.

The dwarf galaxies that we see around large galaxies today are the leftovers of this formation process. According to this picture of "hierarchical growth," these dwarf satellite galaxies should be ...

Active black holes have a pancake-shaped structure around them called an accretion disk, which contains hot, electrically charged gas. The plasma that makes up the accretion disk comes from farther ...

New observations of the cosmos show that the dark energy, a mysterious force that accelerates the expansion of the universe, is evolving.