Ma'anar ƙamus na kalmar "interplanetary space" shine yanki ko sarari tsakanin taurari a cikin tsarin hasken rana ko tsakanin tsarin taurari daban-daban. Yana nufin faffadan sararin samaniya da ke wanzuwa fiye da tasirin nauyi na kowane duniyar mutum ko sararin samaniya, inda babu komai ko kadan, kuma yanayin yana siffanta da karancin nau'in barbashi, radiation, da sauran nau'ikan makamashi. An yi la'akari da sararin samaniya a matsayin daya daga cikin mafi yawan mahalli a cikin sararin samaniya, kuma yanki ne mai matukar sha'awar masana kimiyya da ayyukan binciken sararin samaniya.