We usually divide the planets into two groups, but we have two ways of doing this. One way is by location in the Solar System, and the other is by what they are like. The planets are located in the inner and outer parts of the Solar System, so two groups are then formed. The planets are also further classified in several ways. Those ways are by composition, size, position relative to the sun, position …showed first 75 words of 2107 total…

…showed last 75 words of 2107 total…the earth, known as the orbital insertion point. Two orbital maneuvering system (OMS) engines, mounted on either side of the aft fuselage, provide thrust for major orbital changes. For more exacting maneuvers in orbit, 44 small rocket engines, known as the reaction control system, clustered on the shuttle's nose and on either side of the tail, are used. They have proven indispensable in performing the shuttle's important work of retrieving, launching, and repairing satellites in orbit.