Space

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Across
  1. 5. The natural satellite of the earth
  2. 6. A moon, planet or machine that orbits a planet or star
  3. 10. A dwarf planet
  4. 11. The gravitationally bound system of the Sun and the objects that orbit it
  5. 12. The eighth planet from the Sun and the farthest known planet in the Solar System
  6. 13. The second planet from the Sun
  7. 15. Move or be hurled quickly through the air
  8. 16. The fourth planet from the Sun and the second-smallest planet in the Solar System
  9. 18. A person who is studying or has expert knowledge of one or more of the natural or physical sciences
Down
  1. 1. An object that orbits the sun
  2. 2. A system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
  3. 3. All existing matter and space considered as a whole; the cosmos
  4. 4. A luminous ball of gas, mostly hydrogen and helium, held together by its own gravity
  5. 7. The fifth planet from the Sun and the largest in the Solar System
  6. 8. Find (something or someone) unexpectedly or in the course of a search
  7. 9. The smallest planet in the Solar System and the closest to the Sun
  8. 14. The region beyond the earth's atmosphere containing the other planets of the solar system, stars, galaxies, etc; universe
  9. 17. A unit of astronomical distance equivalent to the distance that travels in one year