Across
- 3. elected head of a country
- 6. a weapon that is self-propelled or directed by remote control
- 7. a writer of a book
- 8. the branch of technology concerned with both aviation and space flight
- 11. an artificial body placed in orbit round the planet for communication
Down
- 1. a person with original ideas about what the future will or could be like
- 2. a person selling newspapers
- 4. the person who commands a group, organization, or country
- 5. a university teacher
- 9. an expert in science
- 10. something that does not let you sleep