( ( ( Slightly smaller ) ( than ( ( Earth 's ) moon ) ) ) ( , ( Europa ( ( is ( one ( of ( ( ( only four ) moons ) ( in ( ( the ( solar system ) ) ( with ( an atmosphere ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (NP (RB Slightly) (JJR smaller)) (PP (IN than) (NP (NP (NNP Earth) (POS 's)) (NN moon))))) (, ,) (NP (NNP Europa)) (VP (VBZ is) (NP (NP (CD one)) (PP (IN of) (NP (NP (QP (RB only) (CD four)) (NNS moons)) (PP (IN in) (NP (NP (DT the) (JJ solar) (NN system)) (PP (IN with) (NP (DT an) (NN atmosphere))))))))) (. .)))
Slightly smaller than Earth's moon, Europa is one of only four moons in the solar system with an atmosphere.
(ROOT (S (NP (CD One) (NN way) (SBAR (IN that) (S (NP (DT the) (NN moon)) (VP (VBZ is) (ADJP (JJ different) (PP (IN from) (NP (NN earth)))))))) (VP (VBZ is) (SBAR (IN that) (S (NP (DT the) (NN moon)) (VP (VBZ has) (NP (RB almost) (DT no) (NN atmosphere)))))) (. .)))