AE 1601 Propulsion notes No air in space provides an interesting challenge. Rockets have to get around this by carrying their own fuel and turning that into thrust. A propellor couldn’t work because there are not enough particles to generate thrust. I’d like to know more about how all of these different ways of generating thrust were discovered. I would like to know more about how research in the Aerospace industry has developed, seeing what can be learned from the past to apply to the future