Across
- 4. great and unbelieveable thing or event
- 5. great step in development of branch of any science
- 7. an undentified flying object
- 8. ... environment in space
- 12. somethig that someone had to do in order of his job
- 13. creature from oher planer or star
- 14. the man who travel into space
- 15. something that was not known before
- 16. the planet following the earth
- 17. special spaceship in which people can go into space
- 18. development and systimatization of people's knowledge about physical universe
- 19. the scince that studies occur naturally
Down
- 1. the science that stydies substances and the way in which they act on
- 2. the first planet in solar system
- 3. process of noticing sth
- 6. serious illnesses
- 7. the space where we live
- 9. the suit of astronaut
- 10. the whole humanity
- 11. the scince that studies the space and stars and planets