They believed that the indefinite expansion would spread the stars so far apart that the sky would appear dark throughout and ...

For roughly half a century, astrophysicists have treated the behavior of matter around supermassive black holes as a solved ...

An international team of astronomers has uncovered subtle but significant signs that the cosmic engines powering quasars, ...

Three galaxies are colliding, and all of them are hiding something powerful at their core. This isn’t just rare. It’s unheard ...