( ( Notice ( how ( scattering ( by ( atmospheric molecules ) ) ) ) ) ( ( tends ( to ( whiten ( distant objects ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Notice)) (SBAR (WHADVP (WRB how)) (S (VP (VBG scattering) (PP (IN by) (NP (JJ atmospheric) (NNS molecules))))))) (VP (VBZ tends) (S (VP (TO to) (VP (VB whiten) (NP (JJ distant) (NNS objects)))))) (. .)))
Notice how scattering by atmospheric molecules tends to whiten distant objects.
(ROOT (S (NP (NNP Light)) (VP (VBZ is) (VP (VBN scattered) (PP (IN from) (NP (NP (NNS molecules)) (PP (IN in) (NP (PRP$ our) (NN atmosphere))))))) (. .)))