astronauau scsct kelly isis ban eartrt after his fourth mission in space it w v speciamissn,n,n- enen onont andas. kelly ok rt in groundbreakiki studieieat cocado s s university. ananhehared his experice along the e e cnn's reid ni t t ory. tt kli, back on earth after 340 days in space." astronaut scott kellll retetning to e eth after arly a yr the inrnatioio acstation... ...t eongest period o otime any amamican has ent t space. p"always bitter swe when you leave thihi incrediblala" kelly descscded inin the kazakhstan desert on the soyuz spacecraft.. ...ang with two ruian cosmonauts... . s mission included a baererof tests on t f effectof zero-gravity on thehhuman bo... ...a.a kly was a unique research subject: h twin otlf asasonont kelly, w w wn rth h e whole titi... ....llowinin scientists to mpare how their nearly idtical bodi are dierent ... ...now tt one of them spent most 12 nths on the so-called 'final frontier.' scscsckelllll@ shared hisisis mission with the wrld d . ...with thought provoking observations ... "the thin vaey of the atmosphere o othe of fhe e eth, i i wodn'tay i ilooks heal