A black hole is a geometrically defined region of space time exhibiting such strong gravitational effects that nothing including particles and electromagnetic radiation such as light can escape from inside it. The theory of general relativity predicts that a sufficiently compact mass can deform space time to form a black hole.
1. It was not Albert Einstein that discovered black holes
Albert Einstein only revived the theory of black holes in 1916. Long before that in 1783, a scientist named John Mitchell actually developed the theory after he wondered whether a gravitational force could be so strong that even light particles couldn’t escape it.
2. Trust me you don’t want to go in there
If you fell into a black hole, theory has long suggested that gravity would stretch you out like spaghetti, though your death would come before you reached singularity. But a 2012 study in Nature suggests that quantum effects would cause the event horizon to act much like a wall of fire, instantly burning anyone to death.
3. Movies and Black hole connection
Black holes remain terrific fodder for science fiction books and movies. Check out the science behind the movie “Interstellar,” which relied heavily on theoretical physicist Kip Thorne to bring real science to the Hollywood feature. In fact, work with the special effects of the blockbuster lead to an improvement in the scientific understanding of how distant stars might appear when seen near a fast-spinning black hole.
4. Time is different around black hole
The gravitational pull of a black hole can greatly slow down time itself, according to relativity. If you could take a spaceship to a black hole, orbit around it for awhile, and then fly back to Earth, you would have successfully traveled to the future.
5. Black hole sucks everything and emits nothing
Black holes are black because their gravity is so strong that even light cannot escape. But they do emit radiation, usually called Hawking Radiation, after Stephen Hawking, who first theorized its existence.