In one new theory, it is possible that dark matter exists in a mirror universe where there are only dark versions of forces ...

Violent black hole collisions may create black hole 'morsels' no larger than an asteroid — and these bizarre objects could pave the way to unlocking new physics, a study claims.

Astronomers have measured the weight of a huge black hole — 36 billion times the mass of our sun, or six times the size of our entire solar system — in an old and dead galaxy near Earth. This cosmic ...