@futurebird Formation of moon, 4.5 billion years ago.
One of the things that's most interesting to me about the "galactic" timeline is (another person's chart points this out too…) how many interesting things happen within like, twenty minutes of the big bang. I think most of these details are too technical or if described plainly might mislead a grade school student ("matter/antimatter war completes, matter wins") but there are two things I think are of note: