https://twitter.com/kantyellow/status/1209212647599509504
@kantyellow
What's going on with Betelgeuse dimming?
Short version: It's all happening in the envelope, not in the core.
Red Super Giant pulsations + interaction with giant convective cells.
Will it explode? Very likely, but in the next 100 000 yrs or so... Long version follows

https://pbs.twimg.com/media/EMf8fk4U4AAhmXu.jpg

1960年代からの観測結果を見ても以上に下がってるな
https://twitter.com/5chan_nel (5ch newer account)