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If stars orbit faster than arms, doesn’t this mean that stars have to occasionally change which arm they’re in? How does that work - some sort of gradual re-clu
by wyager 9y ago
If stars orbit faster than arms, doesn’t this mean that stars have to occasionally change which arm they’re in? How does that work - some sort of gradual re-clumping of stars?
- mkempe 9y agoYes, our solar system travels from arm to arm! while the overall shape of the galaxy remains. By the way, our transit between and into these galaxy arms is theorized to coincide with past mass-extinction events, across tens of millions of years.
- civilian 9y agoWhaaat! I never heard about the galaxy arm transit coinciding with mass extinction events. I'm about to google, but do you have a favored source?
- mkempe 9y agoI commented here 10 months ago https://news.ycombinator.com/item?id=14291004 https://news.ycombinator.com/item?id=14291004 in relation to "Mass Extinction and the Structure of the Milky Way (2013) (arxiv.org)"