A quasar is a type of active galactic nucleus—a ... At first I was worried I had made an error," said Achenbach. This galaxy still has the spiral arms of a younger galaxy, which could affect ...

In the 1920s, astronomers thought that the Milky Way was the entire universe. Hubble's discovery revealed a much bigger ...

Quasars are the most luminous type of active galaxy. They emit light across the electromagnetic spectrum, produce powerful ...

"It's extremely rare and exciting to find a quasar-hosting galaxy with spiral arms and a black hole that is more than 400 million times the mass of the Sun -- which is pretty big -- plus young ...