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To: E. Pluribus Unum
"...How many moons of other planets do that?..."

By "do that" I assume you mean have an orbital period equal to its rotational period.

Countless bodies do that. It is a consequence of imperfect, "lumpy" planetary bodies, which greatly magnify the effects of "tidal friction".

Since the Moon and Earth are NOT perfect spheres, there are "lumps" which produce a slightly larger tidal influence when they happen to line up.

Orbit after orbit, as these "lumps" align, the rotational speed of the body slows, until the "lumps" stay in alignment.

Since the Moon is much less massive than the Earth, the Moon has slowed quicker, but each day on Earth, when Earth's "lumpy" side is facing the Moon, a teeny-tiny tidal brake is applied, slowing the Earth. Eventually, both the Earth and Moon will share the same rotational and orbital period with respect to each other.

Other planets and moons are tidally locked with their larger counterparts, it is quite common, and easily explained with resorting to any supernatural forces.
57 posted on 06/05/2014 2:55:55 PM PDT by Rebel_Ace (Tags?!? Tags?!? We don' neeeed no stinkin' Tags!)
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To: Rebel_Ace

Tidal lock is an amazing thing, and so is the fact that the moon can perfectly fit (for now) into the sun for an eclipse.

There’s nothing magical about it. We landed on the sucker using Newton’s rules mostly. I’m not sure how this can turn into a religious debate really.


60 posted on 06/05/2014 3:54:03 PM PDT by Monty22002
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