Gravitational pull of a black hole

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Discussion Overview

The discussion revolves around the gravitational pull of black holes and the possibility of planets orbiting them. It explores theoretical implications, the formation of planetary systems around stars that may eventually become black holes, and references to existing astronomical observations.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant suggests that the gravity of a black hole remains relatively constant due to its mass, questioning if planets can orbit a black hole.
  • Another participant references the first exoplanet discovered around a pulsar, arguing that if a neutron star can have orbiting planets, then a black hole could also have planets orbiting it.
  • A third participant shifts the focus to the formation of planets in stellar systems that will eventually contain a black hole, suggesting that the mass of stars that form black holes could support planetary systems based on evidence from pulsars.

Areas of Agreement / Disagreement

Participants express differing views on the nature of gravitational pull and the conditions under which planets could orbit black holes, indicating that multiple competing views remain without a consensus.

Contextual Notes

The discussion does not resolve the assumptions about gravitational behavior or the specific conditions required for planetary formation around black holes.

Andrew Buren
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Hi, doesn't the gravity of a black hole remain relatively the same? It should because gravitational attraction depends on mass, which stays the same. And if it does, is it posible for a planet to orbit the BH.? (without light, of course)
 
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Well the first exoplanet ever discovered orbited a pulsar:
http://en.wikipedia.org/wiki/PSR_B1257+12
PSR B1257+12 is a neutron star with a strong magnetic field that spins so rapidly that it “pulses”. The density of a neutron star is very close to being a black hole and if it accreted mass from a neighbor it would become a black hole. So, yes, a planet could orbit a black hole.
 
The question isn't really whether or not planets could orbit a BH, but rather, if they could form in a stellar system that will eventually contain a BH. The evidence of exoplanets around pulsars puts at least a lower bound on the stellar mass which will form planetary systems. Since the mass of a star that will form a black hole is just a tad bit higher, it seems likely that these stars could have planetary systems.
 
Thanks
 

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