Pete, List
The Moon BOTH revolves AND rotates
One revolution for each rotation; one rotation
for each revolution. Synchronous, it's called.
The Moon's tides slow the Earth's axial rotation,
making the day longer. In the past the day was
shorter and the number of days per year was greater
Because the angular momentum of the Earth-Moon
system must be conserved, the loss of energy from
the Earth's rotation is "pumped" into the Moon's
orbit causing the Moon to orbit at a greater distance.
The Moon slowly recedes from the Earth and is
doing so today. It will continue getting further and
further away until the Earth either loses the Moon
or the Sun eats us both in about five billion years.
How fast the Earth rotated when the Moon formed
is guesswork (with lots of equations thrown in).
6 hours? 12 hours? How close did the Moon form?
Nobody knows, but outside the Roche Limit (about
three Earth radii) or it would have broken up from
the Earth tides.
You shoulda oughta read that Meteorite List:
http://www.mail-archive.com/[email protected]/msg106159.html
"The Moon DOES rotate on its axis. If it didn't,
we on the Earth would have a slow month-long
changing view of every spot on the Moon. There
would be no "near" side and "far" side. If you were
looking at what we call the near side tonight, in
two weeks you would be looking at the "far" side."
Sterling K. Webb
------------------------------------------------------------------------
----- Original Message -----
From: <[email protected]>
To: "The List" <[email protected]>
Sent: Sunday, May 27, 2012 9:25 PM
Subject: [meteorite-list] Question 1 & 2
# 1 Does anyone have the link to the GIF file that showed
the ISS assembly from start to finish?
# 2 I got the mistake I made clear in my 2 brain cells.
The moon does one revolution every month, always presenting
the same side to the earth. How long since it stopped
it's rotation.
Do the science eggheads have any idea how fast it rotated
after it was formed? Also, how fast did the earth spin at that
time?
Did the moon's tidal effect on the earth cause the earth's
spin to slow?
Thanks,
Pete
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