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Q & A: planetary models

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Most recent answer: 10/22/2007
how would i make a mechanic solar system that has the planets moving but a different speeds because for example pluto goes around the sun less than earth could you please help? thankyou joseph
- joseph (age 13)
prairiewood, australia
You need a set of gears to make the different planets, each attached to its own gear, travel around with different periods. You can even buy things like this, although I believe that good models are expensive.

Mike W.

(published on 10/22/2007)

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