Rocket

A rocket is propelled by a group self- reaction force created by the ejection of mass in a certain direction. Rocket aircraft is moving through the reactive force generated by the disposal of part of its own mass. To fly the rocket, the presence of air or gas environment is not necessary. It can fly both in air and in vacuum. Rockets are propelled by a solid or liquid propellant. Burning fuel to form a gas stream causes movement of a reactive basis. Rockets used to carry equipment and people from Earth to outer space. And are usually the rocket payload satellites in order to connect it to orbit around the Earth. In some of the remaining space flight payload in orbit around the earth, and sometimes leave the spacecraft off the ground and in the depths of space, such as the Apollo moon missions is called a carrier rocket. The disposable launch vehicles are rockets, designed to be used once. Usually separated from the payload and perform an atmospheric reentry. The reusable launch systems on the other hand offer the possibility to recover system intact once it has been used in this way can be used in different releases, reducing manufacturing costs.