Timeline for Why is there no black hole-like activities inside a massive star?
Current License: CC BY-SA 4.0
8 events
| when toggle format | what | by | license | comment | |
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| Mar 9, 2022 at 12:15 | comment | added | PM 2Ring | It's maybe worth mentioning that although pressure opposes gravitational collapse, in GR, pressure also contributes to the spacetime curvature. This becomes important during a core-collapse supernova: a feedback cycle occurs, so as the pressure rises the gravity rises too. | |
| Mar 9, 2022 at 0:24 | comment | added | David Hammen | @leftaroundabout I disagree that this should be the accepted answer. ProfRob's answer is better. I however do not understand the downvote. | |
| Mar 8, 2022 at 22:34 | comment | added | leftaroundabout | This should be the accepted answer. “the high temperatures...works to counteract gravitational collapse” is the crucial point. | |
| Mar 8, 2022 at 7:34 | comment | added | pygri | @DavidHammen thanks for the correction, indeed in the case of a star, uniform density is not anywhere near a correct model | |
| Mar 7, 2022 at 17:34 | comment | added | David Hammen | @pygri What you wrote is true assuming a uniform density. At any point inside an object with non-uniform density, gravitational acceleration increases with depth if the local density is less than 2/3 of the mean density of all the stuff at greater depth. This means that, for example, gravitational acceleration inside the Earth is greater than gravitational acceleration at the Earth's surface all the way down to the core-mantle boundary. Density variation is even stronger in a star. Gravitational acceleration increases with depth well down into a star's core. | |
| Mar 7, 2022 at 16:49 | comment | added | pygri | No, the gravity force is lower near the center and highest at the surface. | |
| Mar 7, 2022 at 15:48 | comment | added | Kavin Ishwaran | I can understand that the internal pressure is enough to prevent gravitational collapse, but just like the surface gravity of Betelgeuse is less compared to our sun's (if I am right), the gravity deep inside the star, let's say a few hundred Kms fromits center will be so intense, by newton's law, we can say that the r is so small . Then why there is no black hole like activities there ? | |
| Mar 7, 2022 at 15:42 | history | answered | David Hammen | CC BY-SA 4.0 |