Understanding the concept of infinity.

Discussion in 'Science and Technology' started by Angelo, Jan 24, 2020.

  1. Angelo
    Offline

    Angelo Gold Member

    Joined:
    Jan 5, 2019
    Messages:
    13,828
    Thanks Received:
    1,992
    Trophy Points:
    290
    Location:
    _Arkansas~_The Natural State_
    Ratings:
    +7,792
    It's my guess that most people cannot comprehend the idea of an infinite expanding universe, or that there can be no end to time or space. It occurs to me, part of the reason could be that when you do a Google search for 'infinity' the very first website to come up is Infiniti cars.

    Any thoughts on this, or is it too heavy to grab onto ?

    Infinity - Wikipedia



     
  2. ReinyDays
    Offline

    ReinyDays VIP Member

    Joined:
    Oct 5, 2019
    Messages:
    1,372
    Thanks Received:
    144
    Trophy Points:
    65
    Location:
    State of Jefferson
    Ratings:
    +723
    I'm not really seeing the connection between the thread title, your comment or the second video ...

    I certainly don't understand the concept of an "infinite expanding universe" ... the universe as we know it in finite ... we can theoretically look back in time to when time = 0, the instant of the Big Bang ... we'd appear to be inside a giant sphere of some distance in diameter ... the video talks about how fast this sphere is expanding, but in this instant, it is of finite volume ...

    There's a lot more to this, of course, and this is intended to explain why the universe isn't currently infinite ...

    The video is an excellent update on the current state of affairs in cosmology ... gravity waves were touched upon and I just want to expand on that by mentioning the LIGO experiment ... something of an amazing success, works great and it's expected to open up many many new avenues of exploration of the early universe ... that's why the astrophysics community is acting all excited of late ...

    The concept of infinity is something of a philosophical idea ... it shows up here and there and we've developed some nice mathemagical trickery to get around it ... neat stuff if you don't mind a lot of algebra ... but, in general, it's something to be avoided ... "dividing by zero is not defined" ... ha ha ha ... easy peasy ...
     
    • Thank You! Thank You! x 1
  3. MarathonMike
    Offline

    MarathonMike Platinum Member

    Joined:
    Dec 30, 2014
    Messages:
    15,785
    Thanks Received:
    4,790
    Trophy Points:
    390
    Location:
    The Southwestern Desert
    Ratings:
    +28,415
    What if our universe is just one of countless universes each expanding or contracting in it's own little piece of infinite space?
     
    • Agree Agree x 1
  4. Angelo
    Offline

    Angelo Gold Member

    Joined:
    Jan 5, 2019
    Messages:
    13,828
    Thanks Received:
    1,992
    Trophy Points:
    290
    Location:
    _Arkansas~_The Natural State_
    Ratings:
    +7,792
    The thought occurred to me when I saw the title of this video;


    I haven't watched it mainly because it seems to be
    a very short-sighted assumption. How can time end ? It's impossible.
     
  5. fncceo
    Offline

    fncceo Gold Member

    Joined:
    Nov 29, 2016
    Messages:
    21,163
    Thanks Received:
    3,133
    Trophy Points:
    290
    Ratings:
    +29,343
    "Imagine you're in a grocery story. There are 20 people in line ahead of you. Everyone has two carts. None of the items are labeled. Everyone is paying by two-party, out-of-state check. It's the check out girl's first day and she doesn't speak English."

    -- Emo Philips.
     
    • Funny Funny x 2
    • Funny and Agree!! Funny and Agree!! x 1
  6. Damaged Eagle
    Offline

    Damaged Eagle My God it'll be beautiful! Gold Supporting Member Supporting Member

    Joined:
    Jul 28, 2015
    Messages:
    12,226
    Thanks Received:
    16,729
    Trophy Points:
    2,445
    Location:
    Anywhere but Toontown
    Ratings:
    +24,186
    [​IMG]

    *****CHUCKLE*****



    :)
     
  7. Fort Fun Indiana
    Offline

    Fort Fun Indiana Platinum Member

    Joined:
    Mar 10, 2017
    Messages:
    35,755
    Thanks Received:
    2,227
    Trophy Points:
    1,155
    Ratings:
    +15,999
    But, to be clear, these are not the same concept. Something can be finite, yet boundless. That may be true of our universe, in fact.
     
  8. Angelo
    Offline

    Angelo Gold Member

    Joined:
    Jan 5, 2019
    Messages:
    13,828
    Thanks Received:
    1,992
    Trophy Points:
    290
    Location:
    _Arkansas~_The Natural State_
    Ratings:
    +7,792
    If every last star eventually goes dark trillions of light years from now,
    it still won't be the end of time or space, only light.
     
  9. Fort Fun Indiana
    Offline

    Fort Fun Indiana Platinum Member

    Joined:
    Mar 10, 2017
    Messages:
    35,755
    Thanks Received:
    2,227
    Trophy Points:
    1,155
    Ratings:
    +15,999
    Yup. But that doesn't necessarily mean, "infinite time". It just means we observers living in this universe will never reach a "boundary", i.e., and end.

    But, eventually, you run into tasty apparent "paradoxes", akin to "if a tree falls and nobody hears it...", as we eventually would not be able to receive or send any information. We would be incapable of observation, as an electrical signal from one of our neurons would never reach another neuron. There would be no "potentials", anywhere.

    If the universe (read: spacetime) is indeed boundless, the same principle would apply for one of us traveling backward in time: No "beginning".
     
    Last edited: Jan 25, 2020
  10. Angelo
    Offline

    Angelo Gold Member

    Joined:
    Jan 5, 2019
    Messages:
    13,828
    Thanks Received:
    1,992
    Trophy Points:
    290
    Location:
    _Arkansas~_The Natural State_
    Ratings:
    +7,792
    See we can only define time within our own limited interpretation of it based on our short lifetimes and relatively
    short existence as a living planet. So by infinity, I'm not talking about 'time' as we define it but the perpetual existence of time, space and matter, in all their forms.

    Never mind when it began or how far it will expand.
    I'm just saying there can be no 'end'. No defining stopping point. No edge where everything ceases to exist because that would be impossible. We've seen it even though we'll never fully understand it......it just is.
     
    Last edited: Jan 29, 2020

Share This Page