Exploring Space

3. speed that has a direction
6. a way of collecting data from earth or other things in space indirectly
8. the feeling of weightlessness that is experienced by astronauts in space
9. any object that revolves around another object in space
10. large human made object that revolves around the earth on which people can live and work for long periods of time
11. a Device that expels gas in one direction to move in the opposite direction.
13. the speed a rocket must have in order to fly away from a planet's gravitational pull
15. small robots that move around the surface of planets to collect data

1. spacecraft that carries scientific instruments that can collect data, but have no humans on board
2. place that is empty of all matter
4. the speed that a rocket needs in order to get into orbit around earth
5. the reaction force that propels a rocket forward
7. an orbit that happens at the same speed as the earth's rotation which causes it to remain above the same place on earth at all time
12. things that are first designed for space but is changed a little to be useful on earth
14. spacecraft that can carry people into into space and return