Ma'anar ƙamus na "interplanetary media" yana nufin sarari tsakanin taurari a cikin tsarin hasken rana, wanda ba cikakke ba ne amma ya ƙunshi nau'o'in kwayoyin halitta kamar gas, ƙura, da hasken sararin samaniya. Wannan sarari kuma ana kiransa da sararin samaniya ko muhallin duniya. Wani yanki ne mai mahimmanci na bincike ga masana sararin samaniya da masana kimiyyar sararin samaniya saboda yana iya shafar ayyukan sararin samaniya kuma yana iya ba da haske game da samuwar tsarin hasken rana da juyin halitta.