Slang's space cadet `an eccentric, especially one who is stuporous or out of touch with reality' evolved from  Tom Corbett, Space Cadet,  a 1950 television series depicting the adventures of a 24th-century cadet in the Solar Guides, the interplanetary police force keeping order in the Solar Alliance.
( ( ( Slang 's ) space ) ( ( cadet ( ` ( ( ( ( ( an eccentric ) , ) ( ( especially one ) ( who ( is ( ( stuporous or ) ( out ( of ( touch ( with ( ( ( ( ( ( reality ' ) ( evolved ( from ( Tom Corbett ) ) ) ) , ) ( Space Cadet ) ) , ) ( ( a ( 1950 ( television series ) ) ) ( depicting ( ( the adventures ) ( of ( ( a ( 24th-century cadet ) ) ( in ( the ( Solar Guides ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) , ) ( ( the ( interplanetary ( police force ) ) ) ( keeping ( order ( in ( the ( Solar Alliance ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Slang) (POS 's)) (NN space)) (VP (VBZ cadet) (NP (`` `) (NP (DT an) (NN eccentric)) (, ,) (NP (NP (RB especially) (CD one)) (SBAR (WHNP (WP who)) (S (VP (VBZ is) (UCP (ADJP (JJ stuporous)) (CC or) (PP (RB out) (IN of) (VP (VB touch) (PP (IN with) (NP (NP (NN reality)) ('' ') (VP (VBN evolved) (PP (IN from) (NP (NNP Tom) (NNP Corbett)))) (, ,) (NP (NNP Space) (NNP Cadet)) (, ,) (NP (NP (DT a) (CD 1950) (NN television) (NN series)) (VP (VBG depicting) (NP (NP (DT the) (NNS adventures)) (PP (IN of) (NP (NP (DT a) (JJ 24th-century) (NN cadet)) (PP (IN in) (NP (DT the) (NNP Solar) (NNPS Guides))))))))))))))))) (, ,) (NP (NP (DT the) (JJ interplanetary) (NN police) (NN force)) (VP (VBG keeping) (NP (NP (NN order)) (PP (IN in) (NP (DT the) (NNP Solar) (NNP Alliance)))))))) (. .)))
The 1950s television series was critically acclaimed for its novel approach to science-fiction.
( ( The ( 1950s ( television series ) ) ) ( ( ( was ( critically ( acclaimed ( for ( its ( novel approach ) ) ) ) ) ) ( to science-fiction ) ) . ) )
(ROOT (S (NP (DT The) (CD 1950s) (NN television) (NN series)) (VP (VBD was) (ADJP (RB critically) (JJ acclaimed) (PP (IN for) (NP (PRP$ its) (NN novel) (NN approach)))) (PP (TO to) (NP (NN science-fiction)))) (. .)))