▁on ▁their ▁distance ▁from ▁their ▁local ▁sun , ▁with ▁plan ets ▁far ▁outside ▁the ▁habit able ▁zone ▁typically ▁being ▁bar ren ▁of ▁life . ▁Not ▁all ▁stars ▁have ▁habit able ▁plan ets , ▁but ▁still ▁offer ▁potential ▁opportun ities ▁for ▁resources ▁to ▁the ▁player ▁if ▁they ▁can ▁surv ive ▁its ▁in h osp itable ▁atmosphere . ▁The ▁developers ▁aim ed ▁for ▁a ▁ 9 0 – 1 0 ▁rule , ▁with ▁around ▁ 9 0 % ▁of ▁the ▁plan ets ▁being ▁un in hab itable , ▁and ▁of ▁the ▁ 1 0 % ▁that ▁do ▁support ▁life , ▁ 9 0 % ▁of ▁those ▁only ▁include ▁m und ane ▁life forms , ▁making ▁the ▁plan ets ▁that ▁th rive ▁with ▁a ▁v ivid ▁e cos ystem ▁rare . ▁ ▁Some ▁fac ets ▁of ▁real ism ▁have ▁been ▁conced ed ▁in ▁favor ▁of ▁prom oting ▁better ▁game play . ▁The ▁planet ary ▁generator ▁system ▁does ▁not ▁generate ▁any ▁gas ▁gi ants , ▁as ▁Murray ▁wants ▁every ▁planet ▁in ▁the ▁game ▁to ▁be ▁expl or able . ▁Un like ▁most ▁plan ets ▁containing ▁an ▁atmosphere ▁where ▁the ▁atmosphere ▁is ▁vis ibly ▁more ▁dense ▁closest ▁to ▁the ▁surface , ▁planet ary ▁atmos pher es ▁in ▁No ▁Man ' s ▁Sky ▁are ▁revers ed ▁as ▁to ▁provide ▁a ▁more ▁dram atic ▁transition ▁when ▁a ▁player ▁is ▁taking ▁off ▁or ▁landing ▁on ▁a ▁planet . ▁Other ▁elements ▁of ▁their ▁proced ural ▁generation ▁system ▁were ▁made ▁to ▁break ▁the ▁real ism ▁that ▁was ▁previously ▁built ▁into ▁the ▁engine ▁as