Across
- 2. (n.)any communication that encodes(加密) a message
- 6. a vehicle shaped like a tube(管子)that travels in space
- 8. the force that makes any two objects that have mass move toward each other. The most common example of this is when an object falls to the ground
- 12. to control what something will be
- 13. (adj.)you are sad because something has not happened or because something is not as good as you had hoped
- 15. the whole of space and all the stars,planets,and other forms of matter and energy in it
- 16. a person trained to travel in a space
- 17. a machine that you travel in or on, especially one with an engine that travels on roads, for example a car, bus.
Down
- 1. human
- 3. a border between two countries
- 4. an object that is sent into space to travel around the Earth in order to receive and send information
- 5. an administrative(行政的) unit of government
- 7. (v.) to move around a large object in space such as a planet
- 9. free from external control and constraint
- 10. (v.)to send a space vehicle, satellite, or other object into the air or into space
- 11. expect and wish
- 14. the plural(复数) of datum