Black holes (picture on left) - are theorized to form when a massive star collapses at the end of its life. Centers of galaxies contain black holes. The gravitational field of a black hole is so great that not even light can escape from a black hole.
Big Bang Theory- the theory that proposes the Universe originated from a state of high temperature and density. This theory says the Universe began about 13.75 billion years ago. One piece of evidence of the Big Bang theory is the existence of cosmic background radiation (top picture). This radiation, from all directions in the sky, is said to be left over from the big bang.
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