quasar

The Hubble Space Telescope (HST) has spotted rare “double quasars” in the distant universe, implying a catastrophic galactic collision in ancient times. Peering back 10 billion years into the universe’s ...

Quasars are among the most extreme astrophysical objects in our universe. They contain supermassive black holes and lie ...

A "spectacular" outburst from a distant quasar in April of this year gave astronomers the opportunity to measure the ...

Quasars emit a light as bright as that of one trillion stars. Scientists think they get their energy ...

When astronomers look at the universe on a grand scale—when they step back to view the arrangement of ...

A comet carrying enough water to fill a small lake provided astronomers with the first tangible evidence to ...