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Quasars, the most extreme phenomena in the universe, are triggered when galactic collisions deliver gas to feeding black holes, new research suggests. ....
Quasars, the most extreme phenomena in the universe, are triggered when galactic collisions deliver gas to feeding black holes, new research suggests. ....
One of greatest discoveries of the 20th Century was that there are galaxies beyond our own, and astronomer Edwin Hubble was a key figure in this revelation. ....