[Bonus] Galaxies Made from Antimatter, Transparency of Science, Favourite Lagrange Point Reveal | Q&A 302

There is a Larry Niven story about a small party of privileged people paying to see "the most unusual destination in the known universe", which turns out to be an antimatter planet (Aaaaa! Don't land!)

I have wondered if, in the early universe, there was a large amount of anti-matter and way more matter than there is today (perhaps as much as 100X as much mass as there is now), could that have triggered galaxy and black hole formation way faster? Could that be an explanation for why we see black holes and galaxies much more evolved and larger than expected? Could it also explain the variations in the CMB? If the matter and anti-matter annihilated each other before the recombination epoch, then we would see no evidence of that recombining period. But even if all that matter and anti-matter annihilated each other fairly quickly, that massive initial gravitational "kick" could have kickstarted the formation of blackholes and stars and galaxies. Possible?

If the universe is at least 1000 times bigger than the observable universe this means, that the volume of the universe would be a billion times the volume of the observable universe. I can imagine that there could be vast parts of the universe made of antimatter. And we would not be able to see that. What do professional astronomers say to that?

Im excited to discover I can easily play these videos on my TV!

L3 is the best Earth Lagrange point because that's where I hide my... oops I've said too much.

I haven't watched this video yet but the title gave me pause. I remember hearing that hydrogen and anti-hydrogen have the same spectral fingerprint. This lead me to a thought. What if the visible (in this case the stuff that reacts to light) universe is made up of matter and anti-matter clumped together. Like what we think is all matter could be a mix. Dunno if there are any observational experiments we can conduct to check, but the idea is interesting.