( Gravity ( ( is ( ( the force ) ( that ( ( ( ( keeps ( planets ( in orbit ) ) ) ( around ( the sun ) ) ) and ) ( governs ( ( the rest ) ( of ( ( the motion ) ( in ( the ( solar system ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Gravity)) (VP (VBZ is) (NP (NP (DT the) (NN force)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBZ keeps) (NP (NP (NNS planets)) (PP (IN in) (NP (NN orbit)))) (PP (IN around) (NP (DT the) (NN sun)))) (CC and) (VP (VBZ governs) (NP (NP (DT the) (NN rest)) (PP (IN of) (NP (NP (DT the) (NN motion)) (PP (IN in) (NP (DT the) (JJ solar) (NN system)))))))))))) (. .)))
Gravity is the force that keeps planets in orbit around the sun and governs the rest of the motion in the solar system.
(ROOT (S (NP (NNP Gravity)) (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (NNS orbits)) (PP (IN of) (NP (NP (DT the) (NNS planets)) (PP (IN around) (NP (DT the) (NN sun))))))))) (. .)))
Gravity is responsible for the orbits of the planets around the sun.