Some scientists believe that black holes are the gates to other universes. It is interesting that Einstein's theory of general relativity predicts the existence of black holes that ostensibly allow space travels. The Milky Way's black hole is a super massive black hole located just outside our front door – it lies about 25-28,000 light years away from Earth. Black holes exist not only in our galaxy, but also everywhere in the universe. However, scientists are not able to observe this space time area that prevents anything, even light, from escaping. Astronomers can specify whether black holes exist in a given area by detecting their effect on other matter nearby. It is worth mentioning that black holes can be of one atom size, but also of hundreds of thousand or even million solar masses. According to scientists the Milky Way's black hole has a mass of over 4 million solar masses. It is also known that black holes are permanently expanding by feeding on hundreds of thousands tonnes of matter. However, the Earthlings do not need to worry about the extermination caused by black holes as it is impossible or even ridiculous. Many millions of years need to pass until this scenario becomes real.
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