 Iwadi lri idimule ati idagba opolo ninu awon eranko satileyin ironusi Kant, botileje fun ifuramo aaye; eyun, isoju aaye ayika lamupo ohun kan to siwaju ifuramo gangan ayika na fun ra re.Kant gbagbo pe ohun unda ilaja laarin awon oluseiriri ati awon oluselaakaye.. 
Instead NASA considered adding an External propulsion Module to allow controlled rẹ̀-entry.. 