Famous astronauts

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Across
  1. 1. - The largest planet in our solar system.
  2. 4. - The fourth planet from the sun.
  3. 6. - A rocky object in space.
  4. 10. - The boundless expanse beyond Earth's atmosphere.
  5. 12. - A celestial object with an icy core and a bright tail.
  6. 14. - The closest planet to the sun.
  7. 15. - An ice giant planet.
  8. 16. The eighth planet from the sun.
  9. 17. - An a American private space company
  10. 19. - Earth's natural satellite.
Down
  1. 2. - A celestial body orbiting a star.
  2. 3. Seven people from this country have visited the ISS
  3. 5. - More than 50 ______________ control the systems on the ISS
  4. 7. - The third planet from the sun.
  5. 8. The ISS travels 5 miles in one ___________
  6. 9. - A planet with prominent rings.
  7. 10. - The star at the center of our solar system.
  8. 11. -The study of space
  9. 13. - The second planet from the sun.
  10. 18. - A dwarf planet.
  11. 20. -The path of an object _____ a plane