The Big Bang Theory: How the Universe Began
8. __c___ About how long ago did the big bang occur? a. 4.6 billion years agoc. 13.7 billion years ago. b. 10 billion years agod. 100 million years ago. 9. ___d__ The universe is mostly made up of . a. dark matterc. atoms. b. dark energyd. empty space. ................
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