Ma'anar ƙamus na kalmar "tafiya ta sararin samaniya" aiki ne da wani ɗan sama jannati ko sararin samaniya ke yi a wajen wani jirgin sama a sararin samaniya, yawanci don gudanar da gyare-gyare ko gyare-gyare ko gudanar da gwaje-gwaje. Ya ƙunshi yawo a cikin rigar sararin samaniya da kuma haɗa shi da kumbon yayin da ake gudanar da ayyuka a cikin sararin samaniya. Kalmar "tafiya ta sararin samaniya" kuma ana kiranta da aikin extravehicular (EVA).