The great galalio dicoverd gravity. And he did many tests to make sure his thoery was right. Then in 1665, issac newton made new discoveries about gravity. Then between the two of them made what we know today. They revealed the world.
Black holes are dead stars that suck up everything. And because of this you can see these invisable things by useing an x-ray telascope. You can do some of the tests by dropinga ball. The other one is have someone else drop the ball so that you could watch. That is it.
BAllet
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