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Dremmer
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Can there be planets revolving around black holes? I'm not asking about black holes at the center of galaxies, but other black holes.
bcrowell said:I would have said no, since you'd think that the formation process, which is a supernova, would destroy any planets. But the same would seem to apply to a neutron star, and isn't there at least one neutron star known to have a planet?
Kracatoan said:Yes they can, but said planets would also have to be quite far away from the black hole, otherwise they would have to have enormous rotation speeds in order to stay in a stable orbit. That and it becomes easier and easier to "knock" something into a black hole, the closer it gets.
NobodySpecial said:yes - outside the event horizon there is nothing special about a black hole.
Although in practice a planet would be lucky to survive either the red giant stage of the massive star and the Supernova explosion that created the black hole
Hmm...I would be interested to learn more about this. The WP article on stellar evolution says: "Since the core-collapse supernova mechanism itself is imperfectly understood, it is still not known whether it is possible for a star to collapse directly to a black hole without producing a visible supernova, or whether some supernovae initially form unstable neutron stars which then collapse into black holes..." This makes it sound like the possibility of black hole formation be simple collapse is fairly speculative at this point. Anyone have any pointers to published papers?Radrook said:You don't need a supernova explosion to create a black hole. Simple collapse will do.
bcrowell said:Hmm...I would be interested to learn more about this. The WP article on stellar evolution says: "Since the core-collapse supernova mechanism itself is imperfectly understood, it is still not known whether it is possible for a star to collapse directly to a black hole without producing a visible supernova, or whether some supernovae initially form unstable neutron stars which then collapse into black holes..." This makes it sound like the possibility of black hole formation be simple collapse is fairly speculative at this point. Anyone have any pointers to published papers?
jimgraber said:Search arXiv for "accretion induced collapse" if you want the serious stuff. You'll get over 100 hits.
Wow.Standing Bear said:The gist of orbital velocity is...Vf=Vo(sin alpha)...Maxwell's gravitation equation...been awhile since I had my orbital mechanics class. In a nutshell, the orbital velocity is always greater than the falling velocity...point of orbital equilibrium, Vf= (-3(10^6))=c, so any orbital speed or Vo>>c which Einstein would not like, nor his latter day lackeys... expansion of mass ... Roche be applied...constraining it to a liquid state with concomitant global heating...Hadean place...therefore gravitational radiation must have a velocity of >c... if the black hole is large enough to exceed some horrible limit in size and tears a hole in the universe, then a collapse of space >>>>c can occur in that area with unknown results.
bcrowell said:"Since the core-collapse supernova mechanism itself is imperfectly understood, it is still not known whether it is possible for a star to collapse directly to a black hole without producing a visible supernova, or whether some supernovae initially form unstable neutron stars which then collapse into black holes..."
This makes it sound like the possibility of black hole formation be simple collapse is fairly speculative at this point. Anyone have any pointers to published papers?
I don't see how those two scenarios are related.Standing Bear said:As a skater drawing her legs in while doing a spin and then accelerates her spin in a demonstration of conservation of angular momentum, so too would planets gradually losing orbital distance if they are too close to the star remnant.
I don't see how those two scenarios are related.
I agree with Vanadium 50. Relativistic affects are only apparent at very close distances. If our sun suddenly turned into a black hole, Earth's orbit would remain the same. Earth would be uninhabitable because of the lack of light, rather than being "sucked in".andya said:a planet to orbit a black hole has to be formed with the black hole lucky enough to be outside the sucking radius of the black hole ! ! as if it come out from space towards the black hole it has a tremendous probability to get sucked in before it orbits or until we discover a method to spot it ! so i guess if planets do orbit a black hole , it might be a temporary one , as they would end up crashing the black hole after a while
Yes, it is possible for a black hole to have a planet orbiting it. However, the conditions near a black hole are extreme and not conducive to supporting life as we know it.
A planet near a black hole would need to have a stable orbit and be at a safe distance from the event horizon. Additionally, the planet would need to have a strong enough gravitational pull to counteract the immense pull of the black hole.
No, a planet cannot form from a black hole. Black holes are created from the collapse of massive stars, and their intense gravity prevents anything from escaping, including the formation of a planet.
If a planet got too close to a black hole, it would experience extreme tidal forces and likely be torn apart. This is known as spaghettification.
Currently, there are no confirmed planets orbiting black holes. However, there are some exoplanets that have been detected in binary star systems with one of the stars being a black hole, so it is possible that there are planets orbiting these black holes.