A rocket engine or simply rocket is a jet engine that uses only propellant mass for forming its high speed propulsive jet. Rocket engines are reaction engines and obtain thrust in accordance with Newton's third law. Since they need no external material to form their jet rocket engines can be used for spacecraft propulsion as well as terrestrial uses such as missiles. Most rocket engines are internal combustion engines although non combusting forms also exist.

Plane Or Copter?

5 tips to help with your fear of flying

This article provides individuals with tools to overcome or at least manage a fear of flying. Flying can be an enjoyable experience if anxiety is not an issue.