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.

Among the millions of galaxies that Euclid has documented are a suite of far-flung quasars, galaxies whose ... the light from that distant galaxy is warped around the foreground galaxy, as if ...

For decades, scientists have known that ordinary matter — everything made of atoms — accounts for just 15% of the universe’s ...

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 ...

New research suggests that the largest cosmic structure is even bigger and closer to Earth than we knew. It goes against ...

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

The Andromeda Galaxy's family of dwarfs are an enigma. First it was the unusual flat plane around which more than half of ...

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 ...

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

One of the most powerful objects in the universe is a radio quasar—a spinning black hole ... and how they affect the environment of space around them. Black holes are massive, astrophysical ...

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 ...