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Q: Planets' Rotational Speed ( No Answer,   1 Comment )
Subject: Planets' Rotational Speed
Category: Science > Astronomy
Asked by: dustdevil-ga
List Price: $3.00
Posted: 21 Nov 2005 17:30 PST
Expires: 21 Dec 2005 17:30 PST
Question ID: 596016

Theoretically, how are the speed of rotation of the following three
planets changing?

Mars: increasing or decreasing
Jupiter: increasing or decreasing
Neptune: increasing or decreasing

There is no answer at this time.

Subject: Re: Planets' Rotational Speed
From: canadianhelper-ga on 22 Nov 2005 01:15 PST

As on Earth, the period of rotation of Mars (the length of its day) is
slowing down. However, this effect is three orders of magnitude
smaller than on Earth because the gravitational effect of Phobos is
negligible and the effect is mainly due to the Sun.[12] On Earth, the
gravitational influence of the Moon has a much greater effect.
Eventually, in the far future, the length of a day on Earth will equal
and then exceed the length of a day on Mars.



Jupiter is very gradually slowing down due to the tidal drag produced
by the Galilean satellites. Also, the same tidal forces are changing
the orbits of the moons, very slowly forcing them farther from


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