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Thread: Orbital speed behind the horizon of a BH?

  1. #1 Orbital speed behind the horizon of a BH? 
    Junior Member
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    Oct 2017
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    Is it possible a black hole to support an orbital speed behind the horizon bigger than the speed of light?

    If i use this formulation it seems possible:

    if M=1x10+40 kg. --> 2GM/c2 = Rs = 14831288888888,888888888888888889 m

    Orbital speed = v2 = GM/R if Rs/4 ---> 4GM/Rs>c2 <-- ?????

    I hope someone help
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  2. #2  
    Member Janus's Avatar
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    There are no stable orbits inside a distance of 3/2 that of the event horizon radius of a Schwarzschild black hole. The boundary marking this off is called the photon sphere.
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  3. #3  
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    So what is going to be my speed as i' m going down to singularity? Is it going to be greater than the speed of light?
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  4. #4  
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    Quote Originally Posted by Sanev View Post
    Is it going to be greater than the speed of light?
    No
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