Across
- 5. A large artificial satellite on which people can live and work for long periods.
- 7. A spacecraft that has various scientific instruments that can collect data, including visual images, but has no human crew.
- 9. Speed in a given direction.
- 10. The collection of information about Earth and other objects in space using satellites or probes.
- 11. An orbit in which a satellite orbits Earth at the same rate as Earth rotates and thus stays over the same place all the time.
- 12. A device that expels gas in one direction to move in the opposite direction.
- 14. The condition of experiencing weightlessness in orbit.
Down
- 1. The reaction force that propels a rocket forward.
- 2. The velocity a rocket must achieve to establish an orbit around a body in space.
- 3. A small robotic space probe that can move about the surface of a planet or moon.
- 4. A spacecraft that can carry a crew into space, return to Earth, and then be reused for the same purpose.
- 5. An object that orbits a planet.
- 6. An item that has uses on Earth but was originally developed for use in space.
- 8. The velocity an object must reach to fly beyond a planet’s or moon’s gravitational pull.
- 13. A place that is empty of all matter.