Not yet a reality, but often seriously discussed, is terraforming `aitering an extracterrestrial body to make it capable of supporting  Earth's life forms.
( Not ( ( ( ( ( yet ( a reality ) ) , ) ( ( but ( often seriously ) ) discussed ) ) , ) ( ( is ( ( terraforming ` ) ( ( aitering ( an ( extracterrestrial body ) ) ) ( to ( make ( it ( capable ( of ( supporting ( ( Earth 's ) ( life forms ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (RB Not) (NP (NP (RB yet) (DT a) (NN reality)) (, ,) (VP (PRN (CC but) (ADVP (RB often)) (ADVP (RB seriously))) (VBN discussed)) (, ,)) (VP (VBZ is) (VP (VBG terraforming) (`` `) (S (VP (VBG aitering) (NP (DT an) (JJ extracterrestrial) (NN body)) (S (VP (TO to) (VP (VB make) (S (NP (PRP it)) (ADJP (JJ capable) (PP (IN of) (S (VP (VBG supporting) (NP (NP (NNP Earth) (POS 's)) (NN life) (NNS forms)))))))))))))) (. .)))
Terra forming is the altering of an alien's body to make it capable of supporting Earth life. 
( ( Terra forming ) ( ( is ( ( the altering ) ( of ( ( an ( alien 's ) ) ( body ( to ( make ( it ( capable ( of ( supporting ( Earth life ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Terra) (NNP forming)) (VP (VBZ is) (NP (NP (DT the) (NN altering)) (PP (IN of) (NP (NP (DT an) (NN alien) (POS 's)) (NN body) (S (VP (TO to) (VP (VB make) (S (NP (PRP it)) (ADJP (JJ capable) (PP (IN of) (S (VP (VBG supporting) (NP (NN Earth) (NN life)))))))))))))) (. .)))