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View Diary: Back When the Earth Had Two Moons (67 comments)

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  •  I don't get this part: (3+ / 0-)
    The second moon would have hit relatively slowly, somewhere between 4,500 and 6,700 miles per hour, the astronomers estimate. At that speed it would have taken as long as three hours for the collision to be complete.

    Three hours sounds like a long time for an object traveling that fast. What am I failing to grasp?

    Ds see human suffering and wonder what they can do to relieve it. Rs see human suffering and wonder how they can profit from it.

    by JTinDC on Thu Aug 04, 2011 at 02:00:45 PM PDT

    •  The size of it and the glancing blow (4+ / 0-)
      Recommended by:
      JTinDC, bythesea, BentLiberal, Roger Fox

      it hit with. The object didn't hit head on(even though that what says in the LAT article) it kind of impacted on the Moon and splattered along the far side.

      Getting Democrats together and keeping them that way is like herding cats that are high on meth, through L.A., during an earthquake, in the rain -6.25, -6.10

      by Something the Dog Said on Thu Aug 04, 2011 at 02:04:19 PM PDT

      [ Parent ]

    •  The GLancing blow is also used in another (1+ / 0-)
      Recommended by:

      theory where Mars glances off Earth to form the Moon.

      I like this new 2 moon idea better than the Mars idea, but the glancing blow is good at explaining the uneven Lunar Gravity, the lack of symmetry seen with the Moon.

      FDR 9-23-33, "If we cannot do this one way, we will do it another way. But do it we will.

      by Roger Fox on Thu Aug 04, 2011 at 04:10:48 PM PDT

      [ Parent ]

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