Across
- 1. > going in the wrong direction
- 6. > a small planet which goes round the sun
- 9. > a person who works in a spacecraft
- 10. > a ticket for a journey to a place and back again
- 11. off >> take off
- 15. > how important something or someone is
- 17. > using the most advanced machines and methods
- 18. >> competitor
Down
- 2. > to make something more modern
- 3. > a scientific test
- 4. > to watch something or somebody secretly
- 5. >> simple
- 7. > very interesting
- 8. > not one (of a group of three or more)
- 12. >< real
- 13. > say what you think will happen in the future
- 14. > a Russian astronaut
- 16. > the study of diseases