Black holes likely came before galaxies

Black holes - those massive, invisible objects that suck in everything around them - may have appeared before the galaxies that host them, astronomers said on Wednesday.

The findings could change the understanding of how galaxies first formed, and what role black holes play in the universe.

Most or all galaxies are believed to have black holes at their centers. Just last month astronomers confirmed that our own Milky Way galaxy has a black hole at its center.