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ThePiipeMan
Kepler's work revealed that the orbit of each planet is an ellipse, 
with the sun at one focus.
catlovespop
Kepler's work revealed that the orbit of each planet is an ellipse, 
with the sun at one focus.

Newton's work revealed that if his law of universal gravitation is 
correct, then the orbit of each planet must be an ellipse with the 
sun at one focus.