( ( Without ( its ( atmosphere ( to ( trap ( ( the ( Sun 's ) ) heat ) ) ) ) ) ) ( , ( Venus ( ( would ( have ( ( a ( surface temperature ) ) ( of ( ( ( around 540C ) , ) ( ( lower ( than ( that ( of Mercury ) ) ) ) ( and ( only ( ( slightly higher ) ( than ( ( ( the ( Earth 's ) ) ( average temperature ) ) ( of ( about 160C ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN Without) (NP (PRP$ its) (NN atmosphere) (S (VP (TO to) (VP (NN trap) (NP (NP (DT the) (NNP Sun) (POS 's)) (NN heat))))))) (, ,) (NP (NNP Venus)) (VP (MD would) (VP (VB have) (NP (NP (DT a) (NN surface) (NN temperature)) (PP (IN of) (NP (NP (QP (RB around) (CD 540C))) (, ,) (UCP (ADJP (JJR lower) (PP (IN than) (NP (NP (DT that)) (PP (IN of) (NP (NNP Mercury)))))) (CC and) (ADVP (RB only)) (ADJP (ADJP (RB slightly) (JJR higher)) (PP (IN than) (NP (NP (NP (DT the) (NN Earth) (POS 's)) (JJ average) (NN temperature)) (PP (IN of) (NP (QP (RB about) (CD 160C))))))))))))) (. .)))
Without its atmosphere to trap the Sun's heat, Venus would have a surface temperature of around 540C, lower than that of Mercury and only slightly higher than the Earth's average temperature of about 160C.
(ROOT (S (NP (NNP Venus)) (VP (VBZ has) (NP (NP (DT a) (JJR warmer) (JJ average) (NN surface) (NN temperature)) (PP (IN than) (NP (NN earth))))) (. .)))
Venus has a warmer average surface temperature than earth.