( ( ( Earth 's ) umbra ) ( ( ( ( is not ) ( totally ( dark ( because ( of light ) ) ) ) ) ( scattered ( by ( ( the ( Earth 's ) ) ( transparent atmosphere ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Earth) (POS 's)) (NN umbra)) (VP (VBZ is) (RB not) (ADJP (RB totally) (JJ dark) (PP (RB because) (IN of) (ADJP (JJ light)))) (S (VP (VBN scattered) (PP (IN by) (NP (NP (DT the) (NN Earth) (POS 's)) (JJ transparent) (NN atmosphere)))))) (. .)))
Earth's umbra is not totally dark because of light scattered by the Earth's transparent atmosphere.
(ROOT (S (NP (JJ Transparent) (NN matter)) (VP (VBZ transmits) (ADJP (JJ light) (PP (IN without) (S (VP (VBG scattering) (NP (PRP it))))))) (. .)))