1. The closer you get to a black hole, the flow of time slows dowm compared to flow of time far from the hole.
2. The black hole swallows everything including light
3. At the horizon of the black hole, the threshold around the it is where the escape velocity surpasses the speed of light (it called the point of no return).
4. Black holes were first proposed to exist in the 18th century, but still remained a mathematical curiosity until the first
candidate black hole was found in 1964. It was called Cygnus X-1, an x-ray source in the constellation Cygnus.
5. The shape of a black hole is a sphere
6. There is a massive black hole at the center of the Milky Way galaxy. It's about 30,000 light years away from us and is over 30 million times bigger than our Sun.
7. The sphere surrounding of a black hole is marks where the escape velocity is equal to the speed of light.
8. Black hole is form when the center of a very massive star collapses in upon itself.
9. There are four types of black holes: stellar, intermediate, supermassive, and miniature.
10. Scientists estimate that there are as many as ten million to a billion such black holes in the Milky Way alone.
11. Black holes eventually evaporate.
A fascinating write up
keep it up