A rocket ship is a vehicle that astronauts use to travel into space. A multi-stage rocket has two or more stages each with their own propellent, according to Carl. It is dangerous to launch a rocket, with many failed attempts that ended with disaster, but there have been much more successful attempts that let humans travel into space, to the moon, and into orbit. The rocket ship has appeared in many of the kids' imaginations, but its first actual appearance was Buster Spaces Out.