( ( ( Situation ( with ( ( a ( today 's ) ) gravity ) ) ) ( , ( Sun ( is smaller ) ) ) ) ( , ( Earth ( ( is ( closer ( to ( the Sun ) ) ) ) . ) ) ) )
(ROOT (S (S (S (VP (VBN Situation) (PP (IN with) (NP (NP (DT a) (NN today) (POS 's)) (NN gravity))))) (, ,) (NP (NNP Sun)) (VP (VBZ is) (ADJP (JJR smaller)))) (, ,) (NP (NNP Earth)) (VP (VBZ is) (ADJP (ADJP (JJR closer)) (PP (TO to) (NP (DT the) (NNP Sun))))) (. .)))
Situation with a today's gravity, Sun is smaller, Earth is closer to the Sun.
(ROOT (S (NP (NNP Gravity)) (VP (VBZ attracts) (NP (DT the) (NN earth)) (PP (TO to) (NP (DT the) (NN sun)))) (. .)))