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Thread: Up to 22% Dips Detected in Starlight 1,500 LY Away

  1. #781
    Join Date
    Oct 2017
    Quote Originally Posted by Mudskipper View Post
    they can usually tell from the red-shift and blue-shift, of the sides of the star, if it is rotating, I think...not sure.
    Starlight is a point source. Suppose you were looking down at Ecuador. You could not tell from Doppler if the earth rotates from Chicago towards Quito, Quito to Chicago, the correct way (prograde), retrograde, or anything in between. Looking down at the pole you would not see a Doppler shift. Looking down at a point near the arctic circle you would see some Doppler but not much.

  2. #782
    Join Date
    Oct 2001
    The Space Coast
    JPL News release:
    Wavelength dependent dimming points to micrometer sized dust particles as responsible for the long term dimming. A comet swarm remains the most likely cause of the larger, short-term dimming. These same comets could be a plausible source of the dust for the long-term dimming. More study (of course) is needed.

    "A scientific theory
    Isn't just a hunch or guess
    It's more like a question
    That's been put through a lot of tests
    And when a theory emerges
    Consistent with the facts
    The proof is with science
    The truth is with science"
    -They Might Be Giants, "Science Is Real"

  3. #783
    Join Date
    May 2005
    Another study shows that the dimming might be asymmetric or if it symmetric it might have a ten year or longer period.
    ...I'm still free, you can't take the sky from me.
    You cannot run away from the truth, the world is not big enough. DI Jack Frost
    Don't Panic THGTTG
    Great spirits have always encountered violent opposition from mediocre minds. Einstein

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