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but I often wonder how scientists can possibly be certain of these things.
Scientists are certain only in the mass media simplifications
I remember a anecdote from Stephan Hawking :
he was doing a conference explaining his theory on the origins of the Universe and was interrupted by a old lady ,that said his theory was just a nonsense ,
because as everybody should known the Universe was created, and carried around by the
Big Turtle The point here was that Stephen Hawkins could only reply that his Theory seemed more alike , but on the other hand he admitted that was impossible proof the old lady's theory of the Big Turtle wrong
So even if some scientist may found convincing , as example the Big Bang or the Superstring theories , they could not exclude that instead the Beginning of our universe was caused by a Big Fart of the Big Cosmic Gorilla