this post was submitted on 17 Nov 2023
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There was a time when space was not mostly empty though. That's what the cosmic background radiation shows us.
And everything was being bombarded with comets, asteroids, gamma ray bursts, and all the other horrors of our current universe but right next door. Too much chaos for any sustainability.
True, but you are mixing up a little bit of the timeline of the universe.
The CMB is from a time about 300,000 years after the "big bang" where the entire universe was basically a giant red star. It was the first time that any light could shine, because before that, the entire universe was so dense that literally no light could move. There were no comets or asteroids because there was literally no way for anything solid to form. https://www.esa.int/Science_Exploration/Space_Science/Herschel/Cosmic_Microwave_Background_CMB_radiation
The time of the comets and asteroids were billions of years later. Much later, after the galaxies, and then our solar system developed. This was about 10 billion years after the time that the CMB was being emitted. https://en.wikipedia.org/wiki/Late_Heavy_Bombardment