Black holes are really crazy, in short. They are so wide, deep and strong. And gravity effects time. These are what we will be talking about today ==>
Black holes are, in a way, invisible. Some people think that little black holes are just floating around in our galaxy. And the black hole at the center of our galaxy is called Sagittarius (Sgr) A*. It's a supermassive black hole, about 100 million times the sun (in size).
If you know a bit about Einstein's discoveries, you may know that he discovered that gravity effects time. And, if humans could get close to a black hole and survive, each minute you would spend there is a 1,000 years on Earth. This is because the gravitational pull force of one of these holes is immensely strong.
Sources: National Geographic
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