Galaxy Zoo Talk

how can u say that BLACK WHOLE attract every thing just because of its gravitational force ???? it can even have some other force ????

  • pritesh_haryan by pritesh_haryan

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  • JeanTate by JeanTate in response to pritesh haryan's comment.

    Welcome to Galaxy Zoo, pritesh haryan! 😃

    Your question is a very interesting one, and to answer it comprehensively would require writing a very long book 😮

    So, what follows is an extraordinarily brief summary of just a tiny fraction of the key points; if you're interested in following up on any, you have only to ask.

    • 'black holes' are a prediction, or consequence, of Einstein's General Theory of Relativity (GR for short)
    • GR has been extensively tested, and to date no inconsistencies have been discovered; the Universe seems to act as if GR rules
    • black holes are, per GR, extremely simple objects; from the outside they have just three attributes: mass, angular momentum (often called 'spin', or 'rotation'), and electrical charge
    • the first two of these - mass and angular momentum - create forces on all other objects in the Universe, describable by GR; 'gravitational force' is often used as a shorthand for these
    • a black hole's electrical charge could give rise to 'some other force'; however, at a macroscopic scale, the Universe seems to be 'net neutral', or 'quasi-neutral'
    • in particular, there's no evidence - that I'm aware of - that astronomical black holes, which have estimated masses of ~a dozen to many billion times that of the Sun, are different from any other collection of matter of comparable mass, in regard to net charge
    • as a consequence, any forces due to an astronomical black hole's net charge would be trivial compared with 'its gravitational force'

    Hope this helps.

    Happy hunting! 😄

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  • vrooje by vrooje admin, scientist

    There are other forces in the Universe, and black holes can have electromagnetic fields around them, so they aren't just sources of gravitational force.

    Also, in a sense, black holes aren't that different from you. They are made of matter, and so are you. They exert a force on other matter due to gravity, and so do you. You just don't have nearly as much mass, so your gravitational force is much smaller. But it's the same gravitational force -- just a different magnitude.

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  • lostlens by lostlens

    "The black hole forms from for example a star that is made of the same matter that we are, but once the star has collapsed into the singularity there is no theory as to what that is made of. If the firewall is real, the infalling matter turns into some state that again we do not understand." - Joe Polchinski

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