Ballistic missile
A ballistic missile is a type of missile. It is only powered when it is launched. The power from its upward launch gives it all the energy it needs to get to its target. Most of its flight is not powered. Short-range ballistic missiles stay in the Earth's atmosphere. Intercontinental ballistic missiles (ICBMs) are launched into space but fall back down to Earth. Both of them do not need the engine always on since in space and high in the atmosphere there is almost no wind resistance.