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Rockets work by expelling hot gases that act in the same way as a basketball. The exhaust gas molecules don't weigh very much individually, but they come out of the rocket's nose very fast, giving them a lot of thrust. As a result, the rocket moves in the opposite direction of the exhaust with the same total power.
Rockets make exhaust by burning fuel in a rocket engine. Unlike airplane jet engines, rockets are designed to work in space: they have no air intakes and carry their own oxidants, substances that play the role of oxygen in burning fuel. A rocket's fuel and oxidizer - called propellants - can be either solid or liquid. The space shuttle's side thrusters used solid thrusters, while many modern rockets use liquid thrusters.
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