Think of it this way - pretend your'e floating in space next to somebody else.
You push them. You're BOTH going to start moving in opposite directions, right?
Now think on a smaller level - you're floating in space all alone. You throw a wrench.
The wrench will go flying, but you too will go in the opposite direction. Not as fast as you did when you pushed the more massive person, but even so, you WILL move.
Remember that sitting in your rocket, when you fire an engine, you're shooting SOMETHING out of the rocket engine.
Not something as massive as a person, and not even something as massive as a wrench, but you are shooting hot gasses. That gas is made up of atoms which each have mass.
Each atom is like a tiny wrench - it goes flying through space, and you get pushed back in the opposite direction ever so slightly when it gets shot out. But because you're throwing trilliions of little wrenches, "ever so slightly" adds up pretty quickly.
This post was edited by JRSutton at 12:09:16 02/17/14 2 times.
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