http://phet.colorado.edu/sims/my-solar-system/my-solar-system.swf

Gravity, mass and initial velocity are your playthings in your very own solar system! The initial settings on 4 planets are fun to tweak with. Fun fun fun.

Reviewed by A-minus Sep 11 2007, 11:02pm ( 72 reviews ) • colorado.edu

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Rated by Sabin548 on Jul 23, 7:21pm

Interactive planet-motion simulation tool. Works by calculating the motion effects of gravity depending on the objects' mass.
Reviewed by rogette3 on Jun 28, 3:05pm

Both your sites(most of),and your likes,and dislikes with music,etc.,are sooo similar to mine. If anyone is for this USA,inventive,caring,down-to-earth thinking,mature,then THIS IS YOUR SITE TO SEE. rogette3
Rated by VballMaster on Feb 22 2009, 7:57pm

Wow... new perspective on elliptical paths.
Rated by ribcaged on Feb 13 2009, 8:49am

This is definitely interesting.
Rated by DerekDutch on Feb 01 2009, 9:41pm

i'll be busy for a while
Reviewed by OldJerry on Jan 31 2009, 8:38pm

Who at CU designed this?
Rated by rootvetwife on Jan 29 2009, 6:19am

My son is going to ape shit over this one! Very cool! :)
Rated by kiwileon on Jan 26 2009, 9:55pm

lol...i was suppose to study for my exam but ended up playing this sim for 3/2 hour.
Rated by Amicron on Jan 26 2009, 9:10pm

That was fun... I just spent an hour playing with it... trying to gravity assist into a smaller orbit is HARD!

Installing is Easy!