Space shuttle

A space shuttle has three
rocket engines in the back, but
there is absolutely no room
inside for fuel it needs to launch.
All of that fuel is stored outside
the shuttle, in the big brown cylinder called the external tank.
The tank containing all the
rocket fuel weighs seven times
more than the space shuttle
itself.
The space shuttle engines aren't quite as strong enough to push
the combined weight of the
shuttle as the big bloated
external tank up off the ground.
That's what the two long white
solid rocket boosters strapped onto the sides of the external
tank are for.