George Kinley wrote:
Hi,
if there is no Atmosphere, where do rockets that go in Space get thrust from


Goddard was pestered with the same question. The answer is simple, by
pushing against the propellent being thrown out through the engine.

Consider a kid on a very low drag sled and a pile on beanbags. By
throwing the beanbags in one direction, he can build up speed in the
other direction.