Across
- 2. the part of the universe lying outside the limits of the Earth’s atmosphere.
- 7. in the U.S., a person who rides in a space vehicle.
- 9. a quantity with both magnitude and direction, such as velocity, acceleration, thrust, lift, drag, momentum, or torque.
- 11. a vehicle capable of sustaining a person above the terrestrial atmosphere.
- 13. the informal competition between the United States and the Soviet Union to launch unmanned satellites, send people into space, and land them on the Moon.
- 15. the arrangement of the natural and artificial physical features of an area.
- 16. a condition in which no acceleration from gravity or other force can be detected. Zero gravity.
- 18. a chemical mixture that is burned to produce thrust.
- 22. tunnels and caves formed by lava movement in the moon's distant past. These tubes can serve as shelter from meteorites, radiation, and extreme temperatures.
- 23. a vehicle, missile, or aircraft which obtains thrust by the reaction to the ejection of fast moving exhaust from within a rocket engine.
- 26. the locus of all points in the plane at which the sum of the distances from a fixed pair of points is a given constant.
- 27. established in 1958 as the government agency responsible for the United States of America’s space program and long-term general aerospace research. A civilian organization, it conducts or oversees research into both civilian and military aerospace systems.
- 31. operated by automatic or remote control, with no crew or personnel.
- 32. large, dark plains formed by volcanic eruptions. Latin for "seas," early astronomers thought these dark areas on the moon were filled with water. 16% of the moon's surface is covered in maria.
- 33. the path of an object moving through space.
- 34. a vector quantity that includes the speed and direction of an object.
- 35. a proposed explanation for an observation. An educated guess which forms a basis for a test.
Down
- 1. the science of getting ships, aircraft, or spacecraft from place to place.
- 3. of Gravity a fixed point in a material body through which the resultant force of gravitational attraction acts.
- 4. a rille. Rilles are usually named for the craters they are close to. Example: Rima Cavendish is a rille that runs near the Cavendish crater.
- 5. a state of very weak gravity.
- 6. a joint project of the Canadian Space Agency (CSA/ASC), European Space Agency (ESA), Japan Aerospace Exploration Agency (JAXA), Russian Federal Space Agency, and the U.S.' National Aeronautics and Space Administration (NASA). The ISS represents a permanent human presence in space: it has been manned with a crew of at least two since November 2, 2000. The space station is located in orbit around the Earth at an altitude of approximately 360 km, a type of orbit usually termed low Earth orbit.
- 8. a voyage outside the Earth’s atmosphere.
- 10. a path described by one body in its revolution about another.
- 12. the mechanical coupling of two or more human-made orbiting objects.
- 14. a bowl-shaped depression formed in the soft soil of the moon by the impact of a meteorite or other object.
- 17. a vehicle designed for space flight.
- 19. a vehicle for driving over rough terrain.
- 20. fine, greyish dust and soil that covers the surface of the moon. Formed by constant pounding of the surface by impacts, the regolith can be between 2 meters and 20 meters deep.
- 21. a long, narrow valley on the surface of the moon. These grooves or channels can be several kilometers wide and hundreds of kilometers long.
- 24. when a rocket turns and flies into the wind during a launch.
- 25. Cocking
- 28. a fixed or adjustable vane or airfoil affixed longitudinally to an aerodynamically or ballistically designed body for stabilizing purposes.
- 29. a rocket-launched spacecraft able to land like an unpowered aircraft, used for journeys between Earth and craft orbiting the Earth.
- 30. Gravity