Scientists not so sure of rate of expansion now

Discussion in 'Physics & Math' started by curvature, Aug 10, 2018.

  1. curvature Registered Member

    Messages:
    41
  2. Google AdSense Guest Advertisement



    to hide all adverts.
  3. curvature Registered Member

    Messages:
    41
    I have to admit, I never understood why distant lanterns would tell us anything about the current rate of expansion, since that light takes such a long time to reach us, it must be therefore telling us something about the past rather than the current day. At best, those signals tells us that expansion was large early on. Further more, the true interpretation of expansion has to be taken as slowing down because as it has been noted, galaxies that pass through a distance will be moving at a much faster rate than those that pass the same distance at a later time, suggesting the Hubble parameter is in fact decreasing in time.

    https://en.wikipedia.org/wiki/Hubble's_law
     
  4. Google AdSense Guest Advertisement



    to hide all adverts.
  5. mwesson Registered Member

    Messages:
    2
    All I know is there is not one single human being that can explain
    Where the universe began
    Why did the universe begin
    Where did the energy that started the universe come from
    We can discuss atoms, particles, charges, light, etc. etc. but nobody can explain why or from where the energy comes from.
     
  6. Google AdSense Guest Advertisement



    to hide all adverts.
  7. Q-reeus Valued Senior Member

    Messages:
    3,082
    Meaningless question in modern standard cosmological paradigm. Big bang in GR and similar theories was not an explosion into a preexisting flat spacetime void.
    No-one knows but many theorists speculate.
    Not correct, but, there is no universal agreement, so, take your pick:
    https://en.wikipedia.org/wiki/Zero-energy_universe
    http://www.preposterousuniverse.com/blog/2010/02/22/energy-is-not-conserved/
     
  8. RainbowSingularity Valued Senior Member

    Messages:
    1,410
    i am not surprised.
    expansion its self is kinda hard to pin down.
    more soo if everything you measure with is also expanding.
    red-shift was a sign something was not entirely correct.
    gravitational lensing shows there is some weird stuff going on.
    now this...
    it shows scientists have continued to be critical and scientific.
    thats good news !

    who is to say time its self is constant ?
     
  9. Michael 345 Bali 1 week here 2 to go Valued Senior Member

    Messages:
    6,537
    This little Minion contends time does not exist

    Coffee moment and pack for Bali

    Please Register or Log in to view the hidden image!

     
  10. origin In a democracy you deserve the leaders you elect. Valued Senior Member

    Messages:
    10,582
    What's that supposed to mean?
    Incorrect. A red shift is completely consistent with an expanding universe.
    Huh? What do you think is weird about that?
    You mean to slightly different measurements of the expansion?
    You mean it is good that scientist are using the scientific method? That's not really very surprising.
    No one who is scientifically literate would say that.
     
  11. Q-reeus Valued Senior Member

    Messages:
    3,082
    Maybe just in a bad mood. Or justly pissed off with posters e.g. #3 above, who field opinions, get a point-by-point response, yet show no courtesy (or courage) to respond. Pathetic.
     

Share This Page