Assuming you are talking about the program and not the beginning of the universe yea they are usually “bang” on (sorry about the pun) with the science on that show. Its mostly physics stuff so I might miss the odd reference but I’v yet to pick up on anything wrong during the show!
With regards to the the begining of the universe they are very sure what happened up to 0.00000000000000000000000000000000000001 seconds after the first appearence of the universe (and as certain as you can get in science that the big bang itself did happen)
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