( ( If ( ( ( ( the core ) ( is ( ( as ( dense as ) ) ( possible ( -LRB- ( i.e. ( ( completely iron ) -RRB- ) ) ) ) ) ) ) and ) ( ( the mantle ) ( is ( similar ( to ( Earths ' ) ) ) ) ) ) ) ( ( -LRB- ( or ( ( ( ( similar ( to ( the SNC ) ) ) meteorites ) ( thought ( to ( originate ( on Mars ) ) ) ) ) -RRB- ) ) ) ( ( then ( the ( minimum ( core radius ) ) ) ) ( ( is ( ( about 1300 ) km ) ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (S (NP (DT the) (NN core)) (VP (VBZ is) (ADJP (ADVP (RB as) (RB dense) (RB as)) (JJ possible) (PRN (-LRB- -LRB-) (ADVP (RB i.e.)) (ADJP (RB completely) (JJ iron)) (-RRB- -RRB-))))) (CC and) (S (NP (DT the) (NN mantle)) (VP (VBZ is) (ADJP (JJ similar) (PP (TO to) (NP (NNP Earths) (POS ')))))))) (PRN (-LRB- -LRB-) (CC or) (S (NP (ADJP (JJ similar) (PP (TO to) (NP (DT the) (NNP SNC)))) (NNS meteorites)) (VP (VBD thought) (S (VP (TO to) (VP (VB originate) (PP (IN on) (NP (NNP Mars)))))))) (-RRB- -RRB-)) (NP (RB then) (DT the) (JJ minimum) (JJ core) (NNS radius)) (VP (VBZ is) (NP (QP (RB about) (CD 1300)) (NN km))) (. .)))
If the core is as dense as possible (i.e. completely iron) and the mantle is similar to Earths' (or similar to the SNC meteorites thought to originate on Mars) then the minimum core radius is about 1300 km.
(ROOT (S (NP (DT Some) (NNS meteorites)) (VP (VP (VBP are) (VP (VBN made) (PP (IN of) (NP (NN iron) (CC and) (NN nickel))))) (CC and) (VP (VBP are) (VP (VBN thought) (S (VP (TO to) (VP (VB be) (ADJP (RB very) (JJ similar) (PP (TO to) (NP (NP (DT the) (NN core)) (PP (IN of) (NP (DT the) (NN earth)))))))))))) (. .)))