( Then ( ( explores ( ( ( the ( outer planets ) ) , ) ( Jupiter ( , ( Saturn ( , ( Uranus ( , ( Neptune ( and ( tiny Pluto ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (SINV (RB Then) (VP (VBZ explores)) (NP (NP (DT the) (JJ outer) (NNS planets)) (, ,) (NP (NNP Jupiter) (, ,) (NNP Saturn) (, ,) (NNP Uranus) (, ,) (NNP Neptune) (CC and) (JJ tiny) (NNP Pluto))) (. .)))
Then explores the outer planets, Jupiter, Saturn, Uranus, Neptune and tiny Pluto.
(ROOT (S (NP (NNS Uranus)) (VP (VBZ is) (NP (DT the) (ADJP (JJS least) (JJ massive)) (JJ outer) (NN planet))) (. .)))