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Gravitational pull of a black hole

by Andrew Buren
Tags: black, gravitational, hole, pull
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Andrew Buren
#1
Jan22-09, 04:49 AM
P: 18
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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Arch2008
#2
Jan22-09, 08:03 AM
P: 181
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.
Nabeshin
#3
Jan22-09, 08:45 PM
Sci Advisor
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P: 2,193
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.

Andrew Buren
#4
Jan23-09, 03:57 AM
P: 18
Gravitational pull of a black hole

Thanks


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