quasar

Dark energy is even more mysterious than astronomers had thought, a new study suggests.

The fastest growing black hole in the known universe eats a mass the size of the sun every two days.

An enormous gas cloud in the early universe has a very small amount of the heavy elements that would form in later stellar generations, suggesting that it was "polluted" by the very first stars.

Sighting may help improve understanding of the early universe.

The object, called a microquasar, is the first discovered beyond the Milky Way.

The brightest object in the early universe is helping to shine light on conditions soon after the Big Bang.

Huge black holes in these galaxies spew out tremendous amounts of X-rays.