( ( The ( solar wind ) ) ( ( ( ( ( pushes ( the ( ( gas and ) dust ) ) ) away ) , ) ( so ( that ( ( ( the tail ) ( of ( the comet ) ) ) ( always ( ( points away ) ( from ( the sun ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ solar) (NN wind)) (VP (VBZ pushes) (NP (DT the) (NN gas) (CC and) (NN dust)) (ADVP (RB away)) (, ,) (SBAR (RB so) (IN that) (S (NP (NP (DT the) (NN tail)) (PP (IN of) (NP (DT the) (NN comet)))) (VP (ADVP (RB always)) (VBZ points) (PRT (RP away)) (PP (IN from) (NP (DT the) (NN sun))))))) (. .)))
The solar wind pushes the gas and dust away, so that the tail of the comet always points away from the sun.
(ROOT (S (NP (JJ Comet) (NNS tails)) (VP (ADVP (RB always)) (VBP point) (PRT (RP away)) (PP (IN from) (NP (NP (DT the) (NN sun)) (PP (RB instead) (IN of) (S (VP (VBG trailing) (PP (IN behind) (NP (DT the) (ADJP (JJ comet) (PP (IN because) (NP (NN dust) (NNS particles)))) (NN recoil))))))))) (. .)))