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View Diary: A Plausible Scenario for Detecting Alien Civilizations (64 comments)

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  •  I'm not sure the relevance of the question. (4+ / 0-)

    The Moon used to be a lot bigger in the sky, and in the future will be a lot smaller.  It's been receding from the Earth through tidal acceleration ever since its birth.  The fact that we live in an epoch right on the cusp where total eclipses are still possible is most likely a coincidence.

    Technology is a compromise: You can use whatever tool you choose, but be assured it will use you back.

    by Troubadour on Sun Apr 08, 2012 at 03:00:33 PM PDT

    [ Parent ]

    •  Yes, it's even more rare in terms of time (2+ / 0-)
      Recommended by:
      subtropolis, Troubadour

      Appearing to be the same size in the sky is, by definition, subjective.  But it seems that we're in the middle of a period of about 60 million years starting around the beginning of the oligocene when they could seem the same size -- the moon was visibly bigger in the time of the dinosaurs.  So, that's less than 1 percent of the earth's existence!

      I'm not sure but what all moons don't have that mechanical effect of moving slowly away.  Meaning that any planet with one reasonably sized moon would probably go through such a (brief) period.

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