i had the same thought. likewise the sun formed from particles circling around the galactic core. that matters later when it is explained how the sun is moving.
replythat probably happened a few times as well we "stolen" planets or mass from other star systems in the same baby nursery as our sun
replythere is also likely a planet that passed through and yanked away a lot of debris, most of the simulations for tilt etc. don't work without the mystery missing planet
I could watch PBS Space Time all day for that kind of stuff, often do letting it play in the background on repeat, so much better than the news
* https://www.youtube.com/@pbsspacetime/search?query=planets
Dr. Becky is also awesome