Science and technology

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