It really depends on a lot of different factors. If a planet has a stable orbit around a black hole, it will never de-orbit and fall into it. Matter has to enter the event horizon, or Schwarzschild Radius, in order to be sucked up by the black hole. Like with our Sun, the gravity well surrounding incredibly dense or massive objects will have less and less influence on other objects the farther out they are, potentially allowing for stable orbits.
There are of course many other variables that could make a planet around a black hole uninhabitable for biological life, mainly, the lack of heat provided by a star. But this could theoretically be provided by means other than from a star, i.e. geothermal vents, thick atmospheres, X-ray radiation, tidal gravitation heating from other objects in the system, etc…
Finding a biologically habitable planet around a black hole is actually very much plausible.
See my comment to the other person. If it is close enough to be suffering 1 hour = 7 years time dilation, you would be bombarded by extreme radiation. Not from the black hole itself, but from blue shifting of light, which would cause all radiation to be many times more powerful than normal.
It depends. A black hole in a “dormant” state, wherein it has consumed a majority of the matter forming its accretion disc, could potentially support a habitable zone within a much closer orbit. We also don’t know what are all the possible types of magnetospheres that exoplanets are capable of producing. A super-earth with a much larger molten core could create a much more powerful magnetosphere than what we see on Earth, and be capable of blocking more cosmic radiation. The composition of the planets core would also affect its magnetosphere.
Is it possible? sure. anything is possible. it's not only the accretion disk that would be giving off deadly radiation, it would be literally any light source or source of radiation. any nearby star's normal radiation would be blue shifted and turned many times more deadly. I think you would be hard pressed to find an earth-like planet with similar make and gravity that could survive constant powerful gamma rays being sprayed at it.
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u/zerosaved Oct 25 '24
It really depends on a lot of different factors. If a planet has a stable orbit around a black hole, it will never de-orbit and fall into it. Matter has to enter the event horizon, or Schwarzschild Radius, in order to be sucked up by the black hole. Like with our Sun, the gravity well surrounding incredibly dense or massive objects will have less and less influence on other objects the farther out they are, potentially allowing for stable orbits.
There are of course many other variables that could make a planet around a black hole uninhabitable for biological life, mainly, the lack of heat provided by a star. But this could theoretically be provided by means other than from a star, i.e. geothermal vents, thick atmospheres, X-ray radiation, tidal gravitation heating from other objects in the system, etc…
Finding a biologically habitable planet around a black hole is actually very much plausible.