Black Hole Facts

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• Time slows down in black holes. According to Caleb Scharf if you threw a clock into one, assuming it wasn't destroyed, the ticking would slow down and eventually seem to freeze. The gravity inside one is so strong that it can slow down time.
• There is no possible way to escape a black hole without exceeding the speed of light, which is impossible.
• If you were to fall feet first into a black hole, the gravity at your feet would be stronger than at your head, causing you to be torn apart.
• They create a noise when stuff is pulled into them.
• They are incredibly dense. A black hole with the mass of earth would be 9 millimeters across. A black hole that could fit between Mercury and the Sun would have 4 million times the mass of our sun.
• Depending on their mass they can be put into one of the three main groups of black holes - supermassive, stellar, and miniature.
• Astronomers are certain that their is a  supermassive black hole in the center of the Milky Way galaxy .
• You can't directly see a black hole because no light can escape from it.
• The first black hole discovered was Cygnus X-1 in the 1960s but wasn't identified as one until a decade later.