Inexplicable dimming of star. Aliens?

Discussion in 'Science' started by Cadbury, Oct 15, 2015.

  1. Cadbury

    Cadbury Member

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    http://www.popsci.com.au/space/cosm...-built-by-aliens-around-a-distant-star,410514

    This star is one of many observed by Kepler. Its unusual as its showing non-periodic dimming - up to 22%! Astronomers say the variability is not from the star itself, but from something getting in the way. The dimming is too large and irregular to be due to transit of a planet. The leading theory is a massive cloud of comets or asteroids. Another theory is un-natural Dyson structures!
     
  2. damn duck

    damn duck Member

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    This star is 1500 light years away :(
     
  3. power

    power Member

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    yeah something happened 1500 years ago!

    lolol, and it's always aliens too.
     
  4. Sphinx

    Sphinx Member

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  5. Zylatis

    Zylatis Member

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    Probably a swarm of comets
     
  6. RobRoySyd

    RobRoySyd Member

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    They sound like a grand idea until you do the maths.
    Reassembling Earth into a sphere the same radius as its orbit gives a sphere 4mm thick with near no gravity.
     
  7. Billzilla

    Billzilla Member

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    Dyson proposed using all the planets in the solar system, plenty of material then.
     
  8. chook

    chook Member

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    Probably terrorists...
     
  9. RobRoySyd

    RobRoySyd Member

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  10. Billzilla

    Billzilla Member

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    Ah, you're right!
    I hadn't read up on them lately, the Wikipedia entry gives some figures that show the shell being too thin even if we used pretty much everything we could.

    "Also if assuming a radius of one AU, then there may not be sufficient building material in the Solar System to construct a Dyson shell. Anders Sandberg estimates that there is 1.82×1026 kg of easily usable building material in the Solar System, enough for a 1-AU shell with a mass of 600 kg/m2—about 8–20 cm thick on average, depending on the density of the material. This includes the hard-to-access cores of the gas giants; the inner planets alone provide only 11.79×1024 kg, enough for a 1-AU shell with a mass of just 42 kg/m2.[13]"

    https://en.wikipedia.org/wiki/Dyson_sphere#Dyson_shell
     
  11. OP
    OP
    Cadbury

    Cadbury Member

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  12. MR CHILLED

    MR CHILLED D'oh!

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    I'm going with the comet theory, aliens are so 2015.
     
  13. Joehax

    Joehax Member

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    Another successful North Korea nuclear missile test?
     
  14. broccoli

    broccoli Member

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    "There's a starman, waiting in the sky"
     
  15. Phido

    Phido Member

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    Comets are out..

    Apparently you would need 600,000 ~200km size comets in a very unrealistic orbit. Possible but as unlikely as Dyson Spheres.

    http://www.popsci.com/study-confirms-that-alien-megastructure-star-is-weird

    Stars do weird things, Im assuming its something weirdly unstable with the star itself. That could be more interesting than Dyson spheres or what not.

    Im assuming a culture advanced enough to build a Dyson sphere isn't going to be limited to just the material in an average inner solar system.
     
  16. trevor68

    trevor68 Member

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    Get ready for Footfall!
     
  17. chainbolt

    chainbolt Member

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    And they have a giant flashlight! :)
     

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