Results 1 to 6 of 6

Thread: An Open Universe

  1. #1
    Join Date
    Feb 2008
    Posts
    449

    An Open Universe

    Key Words Needed: Bleak

    Thus, within the next 10^14 years, the longest lived stars will cool to very low temperatures. Others, into black holes.

    After 10^15 years, The Sun may have expected to come into contact with another star. This collision is most likely from the Andromeda galaxy.

    After 10^19 years, the central region of the galaxy may be expected to collapse into a black hole.

    Afetr 10^20 years, the Earth-Sun system will decay by radiation of gravitational waves.

    After 10^24 years, steller orbits around the galaxy will decay via gravitational radiation.

    After 10^64 years, a black hole of solar mass will decay by radiation: Decay of any galactic black holes are thought to take 10^100 years to finally reach a state of rediation. At this end, , every black hole will for a very short time, brighten and spark.

    Then after a supermassive 10^1500 years, all ordinary matter will have fissioned, or fusioned to iron through radioatictive processes.

    Nice Future for the Open - Universe eh?

  2. #2
    Join Date
    Dec 2006
    Posts
    13,423
    Quote Originally Posted by Occams Ghost View Post
    Key Words Needed: Bleak

    Thus, within the next 10^14 years, the longest lived stars will cool to very low temperatures. Others, into black holes.

    After 10^15 years, The Sun may have expected to come into contact with another star. This collision is most likely from the Andromeda galaxy.

    After 10^19 years, the central region of the galaxy may be expected to collapse into a black hole.

    Afetr 10^20 years, the Earth-Sun system will decay by radiation of gravitational waves.

    After 10^24 years, steller orbits around the galaxy will decay via gravitational radiation.

    After 10^64 years, a black hole of solar mass will decay by radiation: Decay of any galactic black holes are thought to take 10^100 years to finally reach a state of rediation. At this end, , every black hole will for a very short time, brighten and spark.

    Then after a supermassive 10^1500 years, all ordinary matter will have fissioned, or fusioned to iron through radioatictive processes.

    Nice Future for the Open - Universe eh?
    For an Iron Worker- its GREAT!

  3. #3
    Join Date
    Oct 2005
    Posts
    19,042
    Quote Originally Posted by Occams Ghost View Post
    Nice Future for the Open - Universe eh?
    Yes, put that way it does seem bleak, but note that there is actually an escape hatch here. Closed universes can oscillate, and maybe resuscitate themselves for a nice infinite time-- but at the expense of being spatially finite. Open universes, on the other hand, have a bleak future, but are not constrained to be spatially finite. So if one is sad that the future cannot hold any particular desired outcome, simply go somewhere else-- where that outcome is a present reality! Granted, it won't be inside our light cone, but hey, I'm guessing my own light cone only extends another 30-40 years anyway!

  4. #4
    Join Date
    Jun 2006
    Posts
    262
    This brings back memories when I first read The Last Question by Isaac Asimov
    http://www.multivax.com/last_question.html

  5. #5
    Join Date
    Jul 2005
    Posts
    9,765
    Not so bleak.
    While coming up with these time limits, Freeman Dyson also demonstrated how intelligence in an open universe might still have the time and energy to think an infinite number of thoughts.

    See his essay Time Without End: Physics and Biology in an Open Universe.

    Grant Hutchison

  6. #6
    Join Date
    Oct 2005
    Posts
    19,042
    Indeed, as I recall Tipler and company elevated that to a physical principle-- the strong anthropic principle, that in all possible universes, we would have to find ourselves in one so infinitely computable-- in a "probability that the thought we are having right now would be a thought generated by our universe" kind of mentality. Whether or not such an argument is scientific is debatable, but I would still point out that an infinite number of universes that can generate only a finite number of thoughts (leading up to this one, of course), might outnumber a single one that can generate infinite thoughts along a wordline.

Similar Threads

  1. Acceleration of the expansion of the Universe and open Universe?
    By cosmos0 in forum Space/Astronomy Questions and Answers
    Replies: 10
    Last Post: 2011-Jul-26, 02:51 PM
  2. Astronauts Open New Window on the Universe
    By Fraser in forum Universe Today
    Replies: 0
    Last Post: 2010-Feb-17, 12:20 PM
  3. Portal to the Universe Now Open
    By Fraser in forum Universe Today
    Replies: 0
    Last Post: 2009-Apr-28, 10:00 PM
  4. Time and the Open Universe
    By ScottNash in forum Space/Astronomy Questions and Answers
    Replies: 12
    Last Post: 2007-Apr-01, 01:58 AM
  5. Open the pod bay door Universe Today
    By Fraser in forum Universe Today
    Replies: 0
    Last Post: 2005-Oct-24, 11:43 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
here
The forum is sponsored in-part by: