( ( Sound waves ) ( ( ( can not ) ( ( travel ( in ( ( the vacuum ) ( of space ) ) ) ) ( because ( there ( is ( no ( medium ( to ( transmit ( these ( mechanical waves ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Sound) (NNS waves)) (VP (MD can) (RB not) (VP (VB travel) (PP (IN in) (NP (NP (DT the) (NN vacuum)) (PP (IN of) (NP (NN space))))) (SBAR (IN because) (S (NP (EX there)) (VP (VBZ is) (NP (DT no) (NN medium) (S (VP (TO to) (VP (VB transmit) (NP (DT these) (JJ mechanical) (NNS waves))))))))))) (. .)))
Sound waves cannot travel in the vacuum of space because there is no medium to transmit these mechanical waves.
(ROOT (S (NP (NNP Medium)) (VP (VBZ is) (NP (NP (DT the) (NN matter)) (SBAR (WHPP (IN through) (WHNP (WDT which) (NN sound))) (S (NP (NNS waves)) (VP (VBP travel)))))) (. .)))