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setsunatenshi said:
epicurean said:

So if time didn't exist before the Big-Bang, then it would be correct to say the universe had a beginning? 

Yes, the Big Bang.

 

Pretty much - but this is a hotly debated area of physics.  The opinions have probably changed since I studied!

The basic principle is that time only happens because something physical happens.  So an atomic clock atom decays, or entropy (randomness) increases.  If there is no energy or matter, then nothing happens, so time doesn’t exist.

 

don’t forget that the rate that time passes varies with relative speeds, etc.  So at least that much can be measured experimentally.  I never fully understood what people were saying, so this is my understanding :)