There is no intelligent life on this planet. 
( There ( ( is ( ( no ( intelligent life ) ) ( on ( this planet ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (NP (NP (DT no) (JJ intelligent) (NN life)) (PP (IN on) (NP (DT this) (NN planet))))) (. .)))
There is intelligent life on Mars, it's a fact.
( ( There ( is ( ( intelligent life ) ( on Mars ) ) ) ) ( , ( it ( ( 's ( a fact ) ) . ) ) ) )
(ROOT (S (S (NP (EX There)) (VP (VBZ is) (NP (NP (JJ intelligent) (NN life)) (PP (IN on) (NP (NNP Mars)))))) (, ,) (NP (PRP it)) (VP (VBZ 's) (NP (DT a) (NN fact))) (. .)))