337
this post was submitted on 28 Sep 2023
337 points (98.8% liked)
Technology
58151 readers
4262 users here now
This is a most excellent place for technology news and articles.
Our Rules
- Follow the lemmy.world rules.
- Only tech related content.
- Be excellent to each another!
- Mod approved content bots can post up to 10 articles per day.
- Threads asking for personal tech support may be deleted.
- Politics threads may be removed.
- No memes allowed as posts, OK to post as comments.
- Only approved bots from the list below, to ask if your bot can be added please contact us.
- Check for duplicates before posting, duplicates may be removed
Approved Bots
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
The black hole and the stuff outside it constitute a single system, and within that system, angular momentum is conserved. So as objects cross the event horizon, their angular momentum is transferred to the black hole.
Well.... does it? If all the stuff falls in and only the volume remains, who could say that it's spinning? How could you detect it?
For one thing, the size and shape of the event horizon change depending on the black hole’s spin.
What would happen if one were to stop spinning? Could one even stop spinning?
Yes—it’s called the Penrose process.