James: We could build a jetpack, my father is an engineer and he could help us.
Alex: Sorry James, a jetpack wouldn't work.
Bob: Maybe we could use a hot air balloon like in the movies.
Alex: Seriously?
Bob: Yeah, why not?
Alex: Do you really think a hot air balloon can take us to Jupiter? I mean, it could be useful there since Jupiter is made of gas, but we would never be able to escape our own planet's gravity in a hot air balloon...
Bob: Oh, well... What if we launched ourselves like a rocket into space and went on a trajectory straight to Jupiter?
Alex: We can't just launch ourselves like a rocket, Bob, we would die. But we could use a rocket to take us there.
Bob: Great! We will use a rocket. NASA here I come!
