What seems to be angering the supermassive black holes inside distant, yet powerful, radio galaxies?
The finding could rewrite theories about the formation of galaxies.
The powerful radio source in the center of M87 is a supermassive black hole, ripping away at the heart of the galaxy.
Astronomers have found that some old galaxies are getting a new burst of star formation in rings beyond the extent of the visible light from the galaxy.
We've seen their dazzling beauty, but what exactly is going on in this technicolor picture of the Antennae Galaxies?
Evidence suggests a newly found star is more than 300 times bigger than the sun -- twice the size of anything previously discovered.
The first known case of a quasar acting as a gravitational lens has been discovered, magnifying a distant galaxy and splitting it into two distinct images. Jennifer Ouellette chats with the discoverers.
The burst of X-rays was so strong that it temporarily blinded a NASA satellite.
The story of "Hanny's Voorwerp" -- the mysterious cosmic cloud of "bluey stuff" -- is about to be immortalized in a web comic.
Many of the Milky Way's oldest stars are refugees from other older galaxies that were torn apart by collisions.