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Location: UFOUpDatesList.Com > 2011 > Nov > Nov 13

Aliens Don't Need A Moon Like Ours

From: UFO UpDates - Toronto <post.nul>
Date: Sun, 13 Nov 2011 16:54:42 -0500
Archived: Sun, 13 Nov 2011 16:54:42 -0500
Subject: Aliens Don't Need A Moon Like Ours

Source: NewScientist.Com


13 November 2011

Aliens Don't Need A Moon Like Ours
by David Shiga

Talk about being over the moon. It seems planets don't need a
big satellite like Earth's in order to support life, increasing
the number on which life could exist.

In 1993, Jacques Laskar of the Paris Observatory in France and
colleagues showed that the moon helps stabilise the tilt of
Earth's rotation axis against perturbations by Jupiter's
gravity. The researchers calculated that without the moon,
Jupiter's influence would make the current tilt of some 23
degrees wander chaotically between 0 and 85 degrees. That could
cause huge climate swings, making it hard for life to survive,
especially large, land-based organisms like us.

The result was taken by many to imply that complex life is rare
in the universe, since Earth's large moon is thought to have
coalesced from the debris of a freak collision between a Mars-
sized planet and Earth. Less than 10 per cent of Earth-sized
planets are expected to experience such a trauma, making large
moons a rarity.

But a study now suggests moonless planets have been dismissed
unfairly. "There could be a lot more habitable worlds out
there," says Jack Lissauer of NASA's Ames Research Center in
Moffett Field, California, who led the research.

[More at site... thanks to 'The Norm' for the lead]

Listen to 'Strange Days... Indeed' - The PodCast



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