Definition
The collection of all TransportationDevices propelled by rocket engines which includes earth-to-orbit and moon-to-orbit devices, aircraft, weapons and some unusual instances of automobiles. Rocket engines are self-contained in that they do not need oxygen from the atmosphere to burn fuel and therefore are the only engines capable of space travel. Weapons which are commonly called rockets are here defined as Missiles that are also RocketPropelledTransportationDevices (see Missile_RocketPropelled).
