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In a TV ducumentary, I heard that time started with Big Bang, and it is meaningless to talk of "before". This was given without any further explanation, in the peculiar, irritating style of documentaries.

Now I wonder if this fact may be motivated by the means of motion. Time, afaik, is necessarily measured (or even defined) by motion. "Prior" to Big Bang, no motion, no time.

Is that correct?

NOTE: I have a degree in mathematics (BSc), but almost no knowledge of modern physics, so treat me as a layman when talking about it.

MadHatter
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The Universe we see around us today including the space was once concentrated to a size smaller than an atom. This infinitely dense object may have had a past before that state but no information would make it from that past into our universe so we may as well say that time began at the big bang.

Alex
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