. ▁A ▁unique ▁feature ▁of ▁the ▁Sci en center ▁is ▁the ▁out door ▁science ▁park , ▁featuring ▁a ▁series ▁of ▁inter connected ▁ram ps ▁and ▁structures ▁containing ▁more ▁than ▁two ▁dozen ▁play ground - type ▁activities ▁related ▁to ▁physics , ▁engineering , ▁and ▁ge ology . ▁In ▁ 2 0 0 8 , ▁the ▁Science ▁Play ground ▁was ▁part ▁of ▁a ▁major ▁out door ▁capital ▁improvement ▁project ▁that ▁– ▁in ▁the ▁spirit ▁of ▁past ▁community ▁build ▁events ▁– ▁brought ▁together ▁ 2 7 5 ▁volunte ers ▁from ▁the ▁community ▁to ▁enh ance ▁the ▁park , ▁and ▁other ▁out door ▁learning ▁spaces ▁at ▁the ▁museum . ▁ ▁In ▁ 1 9 9 7 , ▁the ▁Sci en center ▁opened ▁the ▁S agan ▁Planet ▁Walk , ▁an ▁out door ▁walking ▁scale ▁model ▁of ▁the ▁solar ▁system ▁named ▁in ▁memory ▁of ▁Carl ▁S agan ., ▁a ▁member ▁of ▁the ▁Sci en center ' s ▁advis ory ▁board ▁until ▁his ▁death ▁in ▁December ▁ 1 9 9 6 . ▁The ▁exhibition ▁is ▁ 1 , 2 0 0 ▁meters ▁long ▁and ▁extends ▁from ▁the ▁Commons ▁in ▁dow nt own ▁I th aca ▁to ▁the ▁Sci en center . ▁An ▁audio ▁tour ▁for ▁cell ▁ph ones ▁and ▁media ▁players , ▁narr ated ▁by ▁Bill ▁N ye , ▁was ▁added ▁in ▁ 2 0 0 3 , ▁and ▁the ▁Ast ero id ▁station , ▁featuring ▁a ▁real ▁meteor ite , ▁was ▁added ▁in ▁ 2 0 0 9 . ▁In ▁ 2 0 1 8 ▁Aug ment ed ▁Re