Space Crossword Puzzle

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Across
  1. 4. Dwarf planet in the Kuiper belt
  2. 5. the physical universe beyond the earth's atmosphere
  3. 7. the eight farthest planet in the solar system
  4. 10. the seventh farthest planet from the sun in the solar system
  5. 12. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  6. 14. an optical instrument designed to make distant objects appear near
  7. 16. the fifth planet from the Sun and the largest in the Solar System
  8. 17. the fourth planet from the sun in the Solar System
  9. 18. a thin curved shape that's thicker in the middle and tapers to a thin point
Down
  1. 1. a celestial object consisting of a nucleus of ice and dust
  2. 2. Italian astronomer
  3. 3. A Space Shuttle orbiter manufactured by Rockwell International and operated by NASA
  4. 5. Saturn is the sixth planet from the Sun and the second-largest in the Solar System
  5. 6. a small rocky body orbiting the sun
  6. 8. a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it
  7. 9. A fixed luminous point in the night sky which is a large, remote incandescent body like the sun
  8. 11. The mission to get to the Moon
  9. 13. a cloud of gas and dust in outer space
  10. 15. The only habitable planet in our universe
  11. 17. Earth's satellite