Specifies the strength of the gravitiation force
If true, gravity is proportional to r^-2, otherwise r^-1
Adds a body to the controller list.
Removes all bodies from the controller list.
Get the attached body list
Get the next controller in the world's body list.
Get the previous controller in the world's body list.
Removes a body from the controller list.
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Applies simplified gravity between every pair of bodies