[ballaratdragons (Ken)]

Nightshift,

My version of the theory of Rocket propulsion in a void:

An analogy-

If you could open the window of a spacecraft and spit, the spit as it comes out in one direction would actually push you in the opposite. The spit does not hit and push against space as there is nothing to push against. It is the separation of the spit and your mouth at pressure that pushes them apart.

Try this for an experiment. Go outside and sit down on the ground. Throw a rock or something else. Do you feel your body being forced (moving) in the opposite direction? Now imagine that force without Earths air pressure. If you threw a rock in space you and the rock would zoom off at an amazing pace in opposite directions. The harder you throw, the faster you go.

It is not the Earths air pressure on the rock pushing you backwards. It is just two objects pushing each other apart, not one object pushing on space. If it were up to air pressure, then the objects would face resistance and actually not move as far or as fast!

They can actually propel and steer space vehicles with those small soda fountain canisters you buy in the supermarket.

A can of fly spray could make a space vehicle change direction many times before the can ran out of fly spray.

I think that is enough analogies.