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Across 2. Small robots. 7. A large artificial satellite. 8. The reaction force that moves a rocket forward. 9. In your moms mouth 10. The velocity a rocket must reach to fly beyond a planet's gravitational pull.

Down 1. The velocity a rocket must achieve to make an orbit around Earth. 3. A device that gives off gas in one direction to move something in the opposite direction. 4. Speed in a given direction. 5. A spacecraft that can carry a crew into space, return to Earth, and then be reused for the same purpose. 6. An object that moves around another object in space. 7. A spacecraft that carries scientifical instruments that collect data, but has no human crew.