14 of the Most Baffling Mysteries About the Universe

What came before the Big Bang?

If the universe began 15 million years ago with the Big Bang, what preceded it? According to renowned physicist Stephen William Hawking, PhD: Nothing. However, no one can know for sure; any events that happened before the universe came into existence are without “observational consequence,” as Hawking put it, and therefore, we “may as well cut them out of the theory, and say that time began at the Big Bang.” That’s a bit frustrating, so soothe yourself with these 9 quotes about science and knowledge from astrophysicist Neil DeGrasse Tyson.

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