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At that time, two hypotheses were put forward. The release of X-rays in the universe can be caused by the solar wind (a stream of charged particles released from the outer atmosphere of the Sun). But scientists also have another theory that they come from Local Hot Bubble, a theoretical region of five, containing hot gas and covering our Solar System. In the end, which hypothesis was right? We have shown that only 40% of these X-rays are from the solar wind,” says cosmologist physicist Massimiliano Galeazzi, from the University of Miami. “That shows that the rest of the X-rays are coming from Local Hot Bubble, which becomes proof that this giant bubble exists.
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