(May 18, 2022 at 5:50 am)h311inac311 Wrote: So here's something about the big bang which never made sense to me. So as far as I know a simple explanation of what the BB is would be this, we can observe that the universe is constantly expanding, therefore we can assume that if we go backwards in time then the universe is always shrinking. Feel free to correct me if I'm wrong on that point, but that seems to me to be a simple summary of the BB theory.
If that's the case then how is it that, if we reverse time, the sun and earth gradually get closer to each other? If the universe is shrinking then so is the distance between all planets as well, as the stars which they orbit, so wouldn't this mean that earth would be consumed by our massive sun?
Briefly, no.
The sun, Earth, and planets in our solar system formed out of gas and dist about 5 billion years ago.
The Big bang occurred about 14 billion years ago.
That is a 9 billion year difference.
there was a whole generation of stars between the BB and the formation of our solar system.
