Fun fact 7/5/2016

A Lagrange point is a location in space where the combined gravitational forces of two large bodies, such as Earth and the sun or Earth and the moon, equal the centrifugal force felt by a much smaller third body. Which is to say, if placed in a Lagrange point, a third body would stay in a stable position relative to nearby bodies.The interaction of the forces creates a point of equilibrium where a third body may be “parked”.

http://www.space.com/30302-lagrange-points.html

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