Tag: Earth

Good News, Alien Seekers: E.T. Probably Doesn’t Need a Freaky-Big Moon Like Ours

By Seth Shostak | January 24, 2012 1:01 pm

Seth Shostak is Senior Astronomer at the SETI Institute in California, and the host of the weekly radio show and podcast, “Big Picture Science.”

The Moon is a ball of left-over debris from a cosmic collision that took place more than four billion years ago. A Mars-sized asteroid—one of the countless planetesimals that were frantically churning our solar system into existence—hit the infant Earth, bequeathing it a very large, natural satellite.

OK, that’s a bit of modestly engaging astrophysics. But some scientists think there’s a biological angle here. Namely, that elaborate terrestrial life might never have appeared if that asteroid had arrived a few hours earlier, and sailed silently by. Put another way, if every night were moonless, you wouldn’t be around to notice the lack of a moon.

But is that true? Did our cratered companion really make our existence possible?

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CATEGORIZED UNDER: Environment, Top Posts
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