The space

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Across
  1. 4. the / sun / planet / from / seventh / the
  2. 5. force / Earth / the / to / holding / the / us
  3. 7. planet / our / name / the / of
  4. 11. space / person / studies / about / who / a
  5. 13. the / planet / sun / second / the / from
  6. 14. space / a / that / around / moves / rock / in
  7. 16. sun / the / planet / from / farthest / the
  8. 17. sun / the / planet / that / closest / to / the / is
  9. 18. alien / another / for / name / an
  10. 19. gravity / who / discovered / the / person
Down
  1. 1. star / an / moving / a / object / around
  2. 2. the / solar / our / center / star / at / the / of / system
  3. 3. sky / in / night / a / light / the
  4. 6. the / space / travels / in / who / scientis
  5. 8. person / on / walked / the / moon / who / first / the
  6. 9. planet / the / red
  7. 10. of / the / planet / solar / largest / the / system
  8. 12. we / space / the / fly / in / vehicle / to / that / use
  9. 15. with / planet / rings / a
  10. 17. satellite / the / Earth / of