Can A Black Hole End The Universe?


  2. jcsd
  3. jcsd

    jcsd 2,222
    Science Advisor
    Gold Member

    Why should a super-giant and a super-massive blackhole (I assume you mean super-massive as all black holes are massive i.e. they have mass)the universe? That said I wouldn't like to be anywhere near a supergiant being swallowed by a black hole as the radiation from the accretion disc might well turn it into an active galatic nuclei.

    Incidentaly it is strongly believed that there is a supermassive black hole (about 400 million solar masses from the most recent estimates)at the centre of our galaxy, though it is not (currently at least) an active galactic nuclei.
  4. if we all (the universe) got swallowed up by a black hole at the same time, we'd never know, and OUR universe would last forever.
  5. We would know about it, as we got drawn towards it, first we wound notice the destruction that it would be causing around it.
    Then we'd go into a decaying orbit around the hole (along with our sun).
    Then the world would be ripped apart from the immense force of gravity acting on the earth and at the same time we would be hit by many bits of other galactic mass (planets, meteors etc.), we'd probably have been dead for a while by now.
    Then, finally, once we'd been stretched out into long thin spaghetti, we'd be atomised, pass the event horizon and for what would seem to be an infinite amout of time we would fall towards the singularity.

    So yes, in one respect the universe would last forever, however I think that we would know what hit us a while before it did. If a black hole did approach our solar system, we'd notice it's effect on the palnets and the sun long before it got here.
    On the plus side, we'd be able to take all sorts of measurements about it's gravitational field strength, the diameter of the event horizon and all sorts of other stuff that I don't even know about yet.
  6. here's a sci fi thought lets say the more universe evolve with the speed of light or with some speed near the spead of light and we know that the mass increases while you increase the velocity (thus the body [the universe] tries to stop moving in this speed) the slow in the speed is due to the creation within the universe of a black hole that tries to stop the universe itself from speed up and to bring it back to the beginning when there was nothing no time.
    now let's say this black hole has begun its process not at the same time of the big bang but at planck time this way the black hole can never swallow the entire universe unless a mysterious energy will increase it's volume.

    be gentle with me :wink: it's crap but an innovative crap
  7. According to Newton, a body will continue to travel at a constant speed or stay at rest, unless an external force acts on it. There are a maximum of four forces acting on a body at any one time. The strong and weak nuclear force, the electro-static force and gravity. I don't see any reason for the universe to create a black hole out of spite, just to try and stop things moving.
  8. Back to the question...


    Why? Because contrary to popular opinion, something turning into a black hole has almost no effect on it's gravitational attraction at longer distances. And we know that currently, all the mass in the universe is insufficient to counter the expansive force of "dark energy", which is in fact accelerating the expansion of the universe. This means that even if all the mass in the entire universe collapsed into a singularity, it will not be enough to pull it all back in. Besides, in such a case we would have far more pressing matters to worry about... :wink:

    If I remember correctly, of course.
  9. jcsd

    jcsd 2,222
    Science Advisor
    Gold Member

    That is incorrect; from our point of view we would meet the singularity in a finite period of time.
  10. it's the electromagnet force.
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