Science and technology

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