1. Rendezvous is a space manoeuvre in which one spacecraft meets another.
2. Stage is a section of a rocket having its own engine.
3. Microgravity is when a spacecraft's contents and crew float freely, without the feeling of weight that gravity normally produces.
4. Launch Window is the time period when a spacecraft's target - such as a planet or satellite - is properly lined up with the launch point, creating an efficient flight path.
5. Orbital Velocity is the minimum velocity needed to maintain an orbit around the earth or some other body.
6. Payload is the cargo carried into space aboard a spacecraft, including passengers and instruments.
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