Answer: the universe is expanding and getting colder
Explanation: since the universe is expanding, it leads scientists to believe that it was all a super hot dense ball of gas, and its getting colder, which, since massive explosions tend to be pretty hot, it just proves the theory more so. good question, had fun answering
Explanation: Big Bang theory describes the beginning of the universe. Initially all the matter was confined into a single point. During the big bang, the universe started expanding and cooling down. For the first phase of time , the universe was opaque. C M B radiation is the remnant radiation of Big Bang after the initial stage when the universe became transparent. It is detected all around in the sky and has an average temperature of about 3 K. The detection of C M B radiation provides evidence for the Big Bang Theory.
