Rockets
A rocket is a vehicle that travels into the air at a very high speed. It burns fuel to make thrust. Thrust pushes, or propels, the rocket upward. A rocket engine ejects the thrust out of the bottom of the rocket. A lot of energy is required to propel a rocket into space. Energy is necessary to make things happen. Astronauts and cosmonauts are people who travel into space using rockets. Rockets also transport the satellites into their destination orbit. Satellites study the Earth and other objects in the universe.
Rocket Design and Travel
Multiple sections or stages make up the design of most rockets. Each stage contains its own fuel supply and rocket engine.
When its fuel is used up, a rocket is released. This lightens the weight of the rocket. It allows it to travel faster. A rocket needs to travel at least 17,700 miles per hour, (28,500 kilometers) to make it out of the atmosphere into space, which is the so-called "escape velocity". The part of the rocket that actually reaches space is often called a spacecraft.
Booster rockets
Some rockets get extra thrust from booster rockets. The scientists usually attach the boosters to the side of the main rocket. The space shuttle is both a rocket and an airplane. It releases two booster rockets. As the rocket uses up its fuel, it will also release an external fuel tank. The space shuttle lands like an airplane when it returns to Earth.
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