solar system

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Across
  1. 2. an icy dwarf planet in the kuiper belt
  2. 4. the star that the earth revolves around
  3. 6. a small celestial body made up of rock and metal
  4. 7. a shield of gases surrounding the earth or another planet
  5. 9. a small body of matter from outer space
  6. 12. relating to the sky
  7. 13. a huge system of stars held together by gas and dust
  8. 14. all existing matter in space
  9. 17. the emission of energy from electromagnetic waves
  10. 18. the branch of science which deals with celestial objects, space, and the physical universe as a whole.
Down
  1. 1. a celestial body consisting of a nucleus of ice and dust
  2. 2. a celestial body revolving around the sun
  3. 3. the fifth planet from the sun, a gas giant
  4. 5. a celestial body revolving around another
  5. 8. a highly flammable gas
  6. 10. a prominent constellation located on the celestial equator
  7. 11. the sixth planet from the sun
  8. 15. second planet from the sun
  9. 16. the fourth planet from the sun