Here's a simulation of an Earth-moon system.  (Note that mass is proportional
to cube of radius.)

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<applet CODE=moon.class 
WIDTH=600 HEIGHT=500>
<strong>
[Oops, your browser will not display java applets.]
</strong>
</applet>


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See also my <a href="manymoons.html">manymoons applet</a>, and
my <a href="spacetag.html">spacetag game</a>, and
my <a href="index.html">other applets</a>.


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