If Space is Expanding?

Discussion in 'Astronomy, Exobiology, & Cosmology' started by Bowser, Feb 17, 2018.

  1. Q-reeus Valued Senior Member

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    3,056
    This I have not heard of. Any references to alternate cosmological scale standard candles? It's only on such a scale that redshift is reliably tied to Hubble expansion. Otherwise 'peculiar motions' typically dominate.
    To be honest, in hindsight I thought you had simply made a typo of sorts and intended 'rotational' to be 'recessional'. But your response here suggests original wording was 'correct'.
     
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  3. Vociferous Registered Senior Member

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    Yep. While not directly used to measure redshift, the Tully-Fisher relation is a rung on the cosmic distance ladder, used to calibrate larger distance measurements.
    Seemed an easier standard candle to explain briefly, but valid criticism in the context of redshift.
     
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  5. Q-reeus Valued Senior Member

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    OK yes that makes sense now.
     
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  7. socratus Registered Member

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    • Please try to discuss scientific matters in our Science subforums. Religion can be discussed elsewhere.
    The Universe is expanding and the stars run far - far away because . . .
    . . . because they afraid of our intellect.
    #
    . . . the stars run far - far away . . . and gravity became weaker and weaker . . .
    . . . but Great God interfered and didn't give gravity to die . . .
    . . . the Omnipotent God gave gravity a great power to create ''singular point''
    ===
     
  8. RainbowSingularity Valued Senior Member

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    i heard that candles do not burn in space.
    so it doesnt matter who shifts it, Red or anyone else.. i still dont see how your going to get the candle burning.
    ..further more should it not be actively discouraged to be burning fossil fuel candles all over the palce in space ?
    seems a little irresponsible even if they dont lite.

    Dave
    ok so a penny for your expension is literally going to take you longer to spend... ?

    question...
    is spacey stuff like dark matter getting more in the inbetweeny bits ?
    and.. is dark energy being dispersed as the expension continues to spend a penny ?(i hope this is not balooning out of control)
     
  9. exchemist Valued Senior Member

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    A "standard candle" is an astronomer's term for an astronomical object of known luminosity, which can therefore be used for judging how far away it is, by observing how bright it appears to be to us. http://astronomy.swin.edu.au/cosmos/S/Standard Candle

    Nothing to do with trying to light candles in space. Obviously

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    .

    Re your silly remarks about fossil fuel, don't be a tit.
     
    Last edited: Mar 15, 2018
  10. RainbowSingularity Valued Senior Member

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    do lumens also get used for ultraviolet light and infrared light ?
    are they not light ?
     
  11. pluto2 Registered Senior Member

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    854
    Modern physics is a joke.

    Also scientists assume that something can come from nothing which is also quite false.

    The evidence shows that something cannot come from nothing.

    Modern physics has become a religion and is definitely not science.
     
  12. exchemist Valued Senior Member

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  13. exchemist Valued Senior Member

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    Mit der Dummheit kämpfen Götter selbst vergebens.
     
  14. origin In a democracy you deserve the leaders you elect. Valued Senior Member

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    So what you are saying is that if you don't understand something it must be wrong.

    Good luck with that.
     
  15. pluto2 Registered Senior Member

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    854
    I'm not saying it's wrong.

    The people who discovered general relativity and quantum field theory and superstring theory/M-theory were clearly geniuses and very gifted individuals.

    Unfortunately not everyone has a photographic memory and is very good at mathematics, like Albert Einstein or Paul Dirac were, for example.

    What I'm saying is being good at mathematical physics is very difficult and requires many many years of practice for the person who is not a genius.
     
  16. exchemist Valued Senior Member

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    Let's compare your two statements:

    A) Modern physics is a joke and has become a religion.

    B) Mathematical physics is hard to master.

    And you claim A and B are different ways of saying the same thing, do you?
     
  17. pluto2 Registered Senior Member

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    854
    OK so I admit I was wrong because these two statements are clearly not the same thing.
     
  18. exchemist Valued Senior Member

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    So which one reflects your real belief?
     
  19. pluto2 Registered Senior Member

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    854
    My real belief is that mathematical physics takes many many years of practice to master.
     
  20. exchemist Valued Senior Member

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    Nobody could argue with that!

    If what you really meant by the earlier comment was that some theoretical cosmology and GUT theories are so far from making any observational predictions that they are almost beyond science, I would not disagree with that either. Some of this stuff seems to be impossible to confirm experimentally and thus to be (I would argue) in the realm of a sort of mathematical metaphysics, rather than real science.

    But most of modern physics is not like that, of course.
     

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