Ma'anar ƙamus na "motar sararin samaniya" abin hawa ne da aka ƙera don tafiya a sararin samaniya ko bayan sararin duniya. Wannan kalmar yawanci tana nufin jiragen sama waɗanda aka ƙera don jigilar mutane, kayan aikin kimiyya, ko lodin kaya zuwa kuma daga kewayar duniya, wata, ko wasu taurari da taurarin sama. Misalan motocin sararin samaniya sun haɗa da rokoki, jiragen sama, da tauraron dan adam.