10 Mind-Bending Facts About Black Holes

Did you know that black holes are so dense, that one with the mass of the Earth would only be about the size of half a penny? And that time slows (relative to outside the black hole) as one approaches a black hole? We found it incredible to learn that scientists have discovered a black hole with a mass 30 million times that of our Sun and that black hole had swallowed another nearby black hole with a mass 1 million times that of the Sun.

AllTime10s gives us this great video full of cool facts about this fascinating objects.