( ( Interstellar ( ( gas and ) ( cosmic dust ) ) ) . )
(ROOT (S (VP (VB Interstellar) (NP (NP (NN gas)) (CC and) (NP (JJ cosmic) (NN dust)))) (. .)))
Interstellar gas and cosmic dust.
(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))))) (. .)))