Using combined observations from ground-based telescopes over nearly four years, the researchers saw the distant galactic ...

A galactic collision 11 billion light-years away reveals how an actively feeding supermassive black hole disrupts star ...

Astronomers watched as a galaxy with the forgettable name SDSS1335+0728 suddenly sprang to life when its massive black hole ...

Dark matter is more than five times as abundant as all the visible matter in the universe. So why can't we see any of it?

Besides particles like sterile neutrinos, axions and weakly interacting massive particles (WIMPs), a leading candidate for ...

Some stars streaking through the Milky Way at millions of kilometers per hour probably trace back to a supermassive black ...

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Astronomers have observed two distant galaxies — both possessing roughly as many stars as our Milky Way — careening toward ...

As one galaxy smashed into the other, the winner pieced its cosmic victim, leaving behind a high level of radiation in a ...

The quasar’s radiation is stripping away gas in its companion galaxy, leaving behind clumps too compact to form new stars.