Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

Starski asked in Science & MathematicsPhysics · 1 decade ago

Can you fall into a supermassive black hole? (no tidal force issue)?

You are orbiting a supermassive black hole. Time slows (as viewed by an outside observer) the closer you orbit above the hole's event horizon, even though your clock appears to to proceed normally in your reference frame. But the time dilation is real, and you would observe clocks further away from the hole ticking faster.

The closer to the event horizon you come, the faster outside time runs compared to your reference frame. AT the event horizon, outside time appears to move infinitely fast and the Universe ages trillions of years, while your clock would seem to be stopped to an outside observer.

If all the above is true, the black hole will evaporate in Hawking radiation before you can cross the event horizon. How can anything fall in?

http://www.scienceagogo.com/news/black_hole_redux....

Update:

I agree with Bill M's answer that nothing can actually reach the event horizon, but I believe we are in the minority of opinion on this.

4 Answers

Relevance
  • 1 decade ago
    Favorite Answer

    Finally it is all a mathematical construction and theoretical approach.

    No one could ever actually come close to a super-massive black hole, I mean we can't even approach Jupiter without its radiation and gravity destroying a probe or spacecraft ....just the same as we can't travel through space as depicted in so many beautiful, breathtaking documentaries, where you sit in a space ship and see stars flying by.....

    It is an idealized way for us humans to try and visualize concepts and phenomenon we can't really fully understand, just because our perception of space and time is so limited and sort of linear. Physicist try to explain things and force them into mathematical and theoretical structures.....but finally they are kind of arrogant don't you think? I still think there is much more to find out and it will take time to know what a black hole really is and how it looks like.

    I mean looking back at Newton he was pretty smart....but what will we know in 400 years from now when looking back at Einstein and Hawking?

  • ?
    Lv 4
    5 years ago

    Quasars are considered large massive black holes interior the technique of gobbling up finished megastar clusters. What happens is that an accretion disk types around the black hollow which acts to seize in falling count, in any different case it may only persist with a hyperbolic course around the black hollow, in basic terms very infrequently falling into the form horizon. The friction of incredible this sediment disk is what motives countless the radiation of quasars. the tip could probably be speedy, as products could be shifting at relativistic velocity while incredible the disk.

  • Anonymous
    1 decade ago

    It depends what you mean by "fall in". Nothing ever reaches the event horizon, but it's like the bottom of an extremely deep hole.

  • 1 decade ago

    I am not an expert, but I have the idea that arriving at the event horizon you "freeze" and remain there forever as far as the outside universe is concerned. This connects with conservation of information at the event horizon, a much debated mater, but whose intricacies I have not read in any detail. Notice that you do fall-in in a finite time in your clock, but an outside observer will compute your time of fall to be infinite.

    Let me see if I can find a reference. This is from Scientific American

    "You have probably seen the TV commercial in which a cell phone technician travels to remote places and asks on his phone, “Can you hear me now?” Imagine this technician traveling to the center of our Milky Way galaxy, wherein lurks a massive black hole, Sagittarius A* (Sgr A*), weighing as much as 4.5 million suns. As the technician approached within 10 million kilometers of the black hole, we would hear his cadence slow down and his voice deepen and fade, eventually turning to a monotone whisper with diminishing reception. If we were to look, we would see his image turn increasingly red and dim as he became frozen in time near the black hole’s boundary, known as the event horizon.

    The technician himself, however, would experience no slowing of time and would see nothing strange at the location of the event horizon. He would know he had crossed the horizon only when he heard us say, “No, we cannot hear you very well!” He would have no way of sharing his last impressions with us—nothing, not even light, can escape from gravity’s extreme pull inside the event horizon. A minute after he crossed the horizon, the gravitational forces deep inside the hole would tear him apart."

    The incomplete article is here: http://www.scientificamerican.com/article.cfm?id=p...

    Hope this helps.

    ____________________

    [EDIT:] I took a look at your reference, and again my stride broken with non-expert perspective, it seems to me Hawking radiation is a quantum process occurring randomly near the event horizon. It can give you back all the mass-energy of a fallen in astronaut, but how do you get back the exquisite organization of its biological tissue? In my mind this is not a paradox, and it should even occur according to thermodynamics. You get the information (energy) back but it is considerably degraded by increase of entropy.

    Can't see the legs of their argument.

    ___________________________________

    [EDIT 2:] It seems to come down to assuming objects never really cross the event horizon (wrong!) therefore black-holes never form.

    But hey, I am out of my league here.

Still have questions? Get your answers by asking now.