a model rocket is a miniature rocket. they are not launched by the government or a space program. they are used by people interested in rockets. they are normally made of light (not heavy) materials. even though it seems dangerous, it is quite safe and is a way many people start getting interested in rockets and space exploration. rocket motors come in many different sizes, and they are indicated by a code on the motor. there are also many ways for the rocket to fall back down after it is ignited. some of them use parachutes.