I have read in my text books about the Big Bang theory and quote "the entire matter in the universe was once concentrated in a single very dense and hot fire ball; it exploded some 20 billion years ago." My question is this: if we applied the concept of center of mass to the big bang, what would be the situation?

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    $\begingroup$ Related : Did the big bang happen at a point? $\endgroup$
    – 299792458
    Oct 11, 2014 at 14:00
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    $\begingroup$ Can you give us the name(s) of the author(s) of that "textbook"? It's time to send him/her/them a lemon, because he/she/they is/are talking utter nonsense. That's not a home schooling "textbook", by any chance, is it? $\endgroup$
    – CuriousOne
    Oct 11, 2014 at 14:43
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    $\begingroup$ 20 billion years ago? You have a book from the future! $\endgroup$ Oct 11, 2014 at 15:38
  • $\begingroup$ I find it difficult to believe physics textbooks anywhere in the world do contain the nonsense you are quoting. I hope you are not going to convince us such is the case in India? $\endgroup$
    – Johannes
    Oct 11, 2014 at 18:09


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