3) Why do rockets work?

Rockets are by far the most common type of machine used to get stuff into orbit, but how do they work?

2) Why rockets?

Why do various governments and companies use rockets to get stuff to space instead of a variety of other methods people have attempted or imagined?

1) How to put stuff in space

Suppose we want to put something in space. What do we need to do? To answer this, we first have to be clear on what we mean by “put stuff in space”.