( ( ( ( Interstellar medium ) - ) ( ( the ( ( gas and ) dust ) ) ( between ( the stars ) ) ) ) . )
(ROOT (NP (NP (JJ Interstellar) (NN medium)) (: -) (NP (NP (DT the) (NN gas) (CC and) (NN dust)) (PP (IN between) (NP (DT the) (NNS stars)))) (. .)))
Interstellar medium- the gas and dust between the stars.
(ROOT (S (NP (JJ Interstellar) (NN medium)) (VP (VBZ consists) (PP (IN of) (NP (NP (RB thinly) (NN spread) (NN gas)) (CC and) (NP (NN dust))))) (. .)))