, ▁ 3 5 ▁minutes , ▁ 1 ▁second ▁| Un ited ▁States ▁Micro gravity ▁Pay load - 4 SP ART AN - 2 0 1 ▁| - ▁| 1 3 ▁| Col umb ia | ST S - 9 0 ▁| A pril ▁ 1 7 , ▁ 1 9 9 8 ▁| 1 5 ▁days , ▁ 2 1 ▁hours , ▁ 5 0 ▁minutes , ▁ 5 8 ▁seconds ▁| Ne u rol ab ▁| - ▁| 1 4 ▁| Col umb ia | ST S - 1 0 7 ▁| J anu ary ▁ 1 6 , ▁ 2 0 0 3 ▁| 1 5 ▁days , ▁ 2 2 ▁hours , ▁ 2 0 ▁minutes , ▁ 3 2 ▁seconds ▁| SP ACE H AB ▁Research ▁Double ▁Module F REE ST AR , ▁Lost ▁in ▁Space ▁Sh utt le ▁Columbia ▁Dis aster ▁| - ▁| } ▁ ▁E DO ▁medical ▁project ▁ ▁Prior ▁to ▁the ▁E DO ▁project , ▁no ▁sh utt le ▁had ▁flow n ▁a ▁mission ▁longer ▁than ▁ 1 0 ▁days . ▁Since ▁space ▁travel ers ▁may ▁faint ▁when ▁they ▁stand ▁up ▁( orth ost atic ▁int ol er ance ) ▁after ▁returning ▁to ▁normal ▁gravity ▁even ▁after ▁short ▁fl ights , ▁and ▁mus cle ▁strength ▁may ▁be ▁reduced , ▁the ▁E DO MP ▁project ▁focused ▁on ▁ens uring ▁that ▁the ▁crew ▁could ▁land ▁the ▁orb iter , ▁and ▁exit ▁from ▁it ▁without ▁help ▁after ▁a ▁ 1 6 - day ▁flight . ▁A str