A ramjet uses this high pressure in front of the engine to force air through the tube, where it is heated by combusting some of it with fuel. Source: Internet
As descends deeper into the mystery of these spontaneously combusting teens, a variety of survival responses are triggered. Source: Internet
Rocket engines main SpaceX 's Kestrel engine is tested Most rocket engines are internal combustion heat engines (although non combusting forms exist). Source: Internet
Rather than combusting fuel sources, the space probe could instead be powered by a solar thermal engine that absorbs hydrogen from the Sun. Source: Internet