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Science Forum

Science Forum

  1. Standard member uzless
    The So Fist
    05 Aug '11 16:49
    Just read an article an NATURE magazine where they say the earth had 2 moons back in the day. Apparently the smaller one crashed into the larger one to form one moon. That's why the dark side of the moon is cratered and mountanous and the side that faces us is relatively smooth.
  2. Standard member avalanchethecat
    Not actually a cat
    05 Aug '11 17:08
    Originally posted by uzless
    Just read an article an NATURE magazine where they say the earth had 2 moons back in the day. Apparently the smaller one crashed into the larger one to form one moon. That's why the dark side of the moon is cratered and mountanous and the side that faces us is relatively smooth.
    Yeah that's a pretty interesting theory.

    http://www.space.com/12529-earth-2-moons-collision-moon-formation.html
  3. Standard member sonhouse
    Fast and Curious
    05 Aug '11 17:32
    Originally posted by uzless
    Just read an article an NATURE magazine where they say the earth had 2 moons back in the day. Apparently the smaller one crashed into the larger one to form one moon. That's why the dark side of the moon is cratered and mountanous and the side that faces us is relatively smooth.
    That theory certainly explains the facts but we won't know for sure till men scrounge around on the backside of Luna and take samples back like we did with Apollo. The isotope ratios and such will give useful evidence one way or the other.
  4. Standard member Palynka
    Upward Spiral
    05 Aug '11 17:35 / 1 edit
    Originally posted by sonhouse
    That theory certainly explains the facts but we won't know for sure till men scrounge around on the backside of Luna and take samples back like we did with Apollo.
    Kinky.
  5. Standard member sonhouse
    Fast and Curious
    05 Aug '11 22:50
    Originally posted by Palynka
    Kinky.
    Also expensive
  6. Standard member Soothfast
    0,1,1,2,3,5,8,13,21,
    06 Aug '11 00:02
    Earth still has two moons. The other one is Governor Chris Christie.
  7. 06 Aug '11 08:10
    Originally posted by sonhouse
    That theory certainly explains the facts but we won't know for sure till men scrounge around on the backside of Luna and take samples back like we did with Apollo. The isotope ratios and such will give useful evidence one way or the other.
    I doubt that it would be possible to identify whether or not the two objects were moons of earth.
  8. 06 Aug '11 18:05
    Originally posted by uzless
    Just read an article an NATURE magazine where they say the earth had 2 moons back in the day. Apparently the smaller one crashed into the larger one to form one moon. That's why the dark side of the moon is cratered and mountanous and the side that faces us is relatively smooth.
    Surely that's explained just as well by the Moon being tidally locked to the Earth, leaving one side permanently exposed to the ravages of spatial bombardment and the other sheltered by the Earth?

    Richard
  9. 06 Aug '11 18:08
    Originally posted by Soothfast
    Earth still has two moons. The other one is Governor Chris Christie.
    He doesn't circle Earth - he circles the planet Cuomo.

    Richard
  10. Standard member Bosse de Nage
    Zellulärer Automat
    06 Aug '11 18:50
    Earth has two moms.
  11. Standard member sonhouse
    Fast and Curious
    07 Aug '11 13:21 / 1 edit
    Originally posted by twhitehead
    I doubt that it would be possible to identify whether or not the two objects were moons of earth.
    There should be measurable similarities if the mars sized object that supposedly slammed into earth made the two moons with some part of the mix from earth and the rest from that other planet, it should show in the chemical/isotope data.

    That is assuming we go back to the moon, front and back and generate samples.