Solar systems happen because a sun is so massive, it has a gravitational pull that holds all the planets in place. [ She holds up one finger, indicating the sun, and makes several circles with the other index finger. ]
They're always moving, so they just circle around it.
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carisma_sensei
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Date: 2015-02-04 02:56 am (UTC)They're always moving, so they just circle around it.