system
Given the following post, respond as if you're commenting on Reddit:
human
Would a astronaut in orbit around betelgeuse experience the same time dilation as he would with a blackhole the same mass of betelgeuse?
gpt
Yes. The Schwarzschild solution for gravity is true outside any spherical object with minimal rotation But even for a rotating black hole, you would need to be very close to the event horizon to notice any interesting effects - so close that your orbit would be well inside Betelgeuse. At any large distance, gravity is just the normal Newtonian gravity.

If Betelgeuse collapsed into a black hole without expelling any gas (and it actually will expel gas when it goes supernova), that black hole would be about 34 km in radius. Its current radius is maybe 600 million km. So an orbit far enough out to be outside Betelgeuse would be pretty far away from the black hole, and it'd just feel like a normal 1/r^2 gravity force, without any real time dilation.