When all evidence of the big bang disappeard

Discussion in 'Physics & Math' started by yaracuy, Mar 22, 2011.

  1. yaracuy Banned Banned

    Messages:
    364
    The Galaxy are moving at a speed of light , at some point we will be alone and there will be no reference point beside our self ( milky )

    Please Register or Log in to view the hidden image!

     
  2. Google AdSense Guest Advertisement



    to hide all adverts.
  3. rpenner Fully Wired Valued Senior Member

    Messages:
    4,833
    None of the visible galaxies are moving at the speed of light.
    I thought the local group of galaxies was gravitationally bound, so we would not expect to leave them behind.
    Finally, the human species is too likely to be extinct by then.

    http://arxiv.org/abs/0704.0221
     
  4. Google AdSense Guest Advertisement



    to hide all adverts.
  5. yaracuy Banned Banned

    Messages:
    364
     
  6. Google AdSense Guest Advertisement



    to hide all adverts.
  7. spidergoat pubic diorama Valued Senior Member

    Messages:
    54,036
    We won't be alone. We will be extinct.
     
  8. Dywyddyr Penguinaciously duckalicious. Valued Senior Member

    Messages:
    19,252
    Yay!!!
    :yay:
    :thankyou:

    Oh...
     
  9. fedr808 1100101 Valued Senior Member

    Messages:
    6,706
    Wrong, it would take infinite energy to accelerate something at the speed of light. So no, were not.
     
  10. fedr808 1100101 Valued Senior Member

    Messages:
    6,706
     
  11. yaracuy Banned Banned

    Messages:
    364



    Are we not expanding at the speed of light ?

    Please Register or Log in to view the hidden image!

     
  12. Crunchy Cat F-in' *meow* baby!!! Valued Senior Member

    Messages:
    8,423
    Dear lord... the universe is expanding but its not relative to the speed of light at all. No galaxy (or anything with mass) can move at the speed of light or faster. So, why do we observe some galaxies moving away from each other faster than the speed of light (which is a correct observation)? The galaxies aren't themselves traveling at that velocity. What's happening is that new points of space are being added between them (i.e. the universe is expanding) and the end result is that some galaxies are being separated so fast that they *look* like they are moving away from each other at 2x the speed of light.
     
  13. Dinosaur Rational Skeptic Valued Senior Member

    Messages:
    4,885
    The observable universe consists of stars/galaxies receding from us at less than the speed of light. The observable universe from POV of Pluto, is slightly different. The observable universe from POV of a galaxy receding from us at .999c is quite different from our observable universe (it is near the boundary of our observable universe & includes galaxies not in our observable universe).

    The Big Bang expansion can result in two galaxies receding from eachother at a speed greater than c. Each such galaxy cannot have any interaction with the other.

    As galaxies get closer to the limit of our observable universe, they get dimmer due to the red shift. They finally become unobservable at the boundary of our observable universe.

    BTW: There was an article in Scientific American 1-5 years ago titled "The End of Cosomology"

    This article described the observable universe for a technological culture many billions of years in the future (perhaps a trillion years from now). That culture would see only their own galaxy or at most a local group of galaxies. All other galaxiess would be beyond their observable universe.

    Cosmology in that far distant future would be very much like cosmology circa 1850 or perhaps as late as 1900-1920 (prior to Hubble). In that era, the universe was believed to consist of only the Milky Way Galaxy, which was all they could observe.

    In the far future, there would be no observable evidence indicating an expanding universe. A tecnological culture would probably be able to determine the life cycle of stars, but their cosmology would be all wrong, unless records had some how survived from circa our time to theirs.
     

Share This Page