In a message dated 7/12/01 7:55:21 AM, bradbury@aeiveos.com writes:
> The Moon and Plate Tectonics: Why We Are Alone
> http://www.spacedaily.com/news/life-01x1.html
>
>It discusses the fact that the glancing collision
>that produced the moon, in removing a significant
>fraction of the mantle & crust, may have served to enable
>plate tectonics which in turn enables the CO2 recycling
>that provides a stable environment for life to evolve.
>
>If accurate, this tends to increase the number of
>water worlds and decreases the locations where life
>may evolve.
Yes, but doesn't the article greatly overstate the case?:
>>It has become clear that our Moon is a rare celestial object
What about Charon? Double planets don't seem to be *that*
rare. 1 out of 4, once you discount the suggested observer
bias.
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