What are some of the earliest "firsts" that we have a definite date for?
We only know about when humans mastered fire or started using metal. But we know the exact date when the first powered flight took place. What are some really early "first ____" we know the date of for sure?
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Big Bang, T=0.
Well.... Maybe.
Time probably predates the big bang
I kind of wonder if time might be infinite in both directions, just because having a definitive beginning or end would seem to violate the conservation of matter and energy.
Why? Conversation of energy doesn't include time in any way. I'd love to hear your thoughts!
If we know that time precisely and accurately, then we don't know any other times more precisely than millions or billions of years ballpark