us ▁and ▁ground ▁engine ers ▁began ▁review ing ▁the ▁collected ▁data ▁to ▁verify ▁that ▁sh utt le ' s ▁T PS ▁has ▁received ▁no ▁impact ▁damage ▁from ▁mic rom eteor oid s ▁or ▁space ▁j unk ▁during ▁its ▁dock ed ▁operations ▁or ▁fly - around ▁of ▁the ▁station . ▁At ▁the ▁end ▁of ▁a ▁highly ▁successful ▁day ▁in ▁space , ▁the ▁crew ▁members ▁went ▁to ▁bed ▁at ▁ 4 : 5 9 ▁UTC . ▁▁▁▁ 2 0 ▁July ▁( F light ▁Day ▁ 1 3 ▁– ▁P ico S at ▁deployment / Land ing ▁prep ) ▁ ▁Fl ight ▁day ▁ 1 3 ▁was ▁the ▁final ▁full ▁day ▁in ▁space ▁for ▁the ▁ST S - 1 3 5 ▁crew . ▁They ▁spent ▁the ▁day ▁checking ▁out ▁Atl ant is ′ s ▁flight ▁control ▁surfaces ▁and ▁hot - f iring ▁its ▁reaction ▁control ▁system ▁( R CS ) ▁j ets , ▁making ▁sure ▁everything ▁was ▁ready ▁for ▁de or bit . ▁Mission ▁man agers ▁cleared ▁Atl ant is ▁for ▁re - entry ▁after ▁review ing ▁results ▁of ▁the ▁late ▁ins pection ▁survey ▁of ▁the ▁sh utt le ' s ▁heat ▁shield , ▁performed ▁by ▁the ▁crew ▁on ▁the ▁flight ▁day ▁ 1 2 . At lant iss ▁crew ▁also ▁deployed ▁an ▁ 8 . 2 - lb ▁( 3 . 7 - kg ), ▁ 5 × 5 × 1 0 - inch ▁technology ▁demonstr ation ▁p icos at ellite , ▁the ▁P ico - S at ellite ▁Sol ar ▁Cell ▁experiment ▁( P