if there is no Atmosphere, where do rockets
that go in Space get thrust from

Others have already answered the question well, but I just
wanted to say that this is a question that many people
wondered about or misunderstood in the early days of
rocket development. I think I've read quotes from some
prominent people in those days who, to their embarassment
later, declared publically that rockets wouldn't work in space.

Of course many things about space travel can be a little hard
to understand at first, since vacuums, weightlessness, etc.
are things that we normally don't have to think about in our
daily lives.

Jim