Solar system

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Across
  1. 5. a tiny piece of anything
  2. 7. a craft capable of traveling in outer space
  3. 11. half of a round, three-dimensional shape
  4. 14. the path of a celestial body in its revolution about another
  5. 15. a person trained to travel in a spacecraft
Down
  1. 1. any celestial body orbiting around a planet or star
  2. 2. the degree of hotness or coldness of a body or environment
  3. 3. the galaxy containing the solar system
  4. 4. bands of light caused by charged solar particles
  5. 6. a celestial body that revolves around the sun
  6. 7. a stream of protons moving radially from the sun
  7. 8. a small frozen mass that travels around the sun
  8. 9. a small celestial body composed of rock and metal
  9. 10. a mass that enters earth's atmosphere, becoming incandescent
  10. 12. relating to the sun or utilizing the energies of the sun
  11. 13. a Russian artificial satellite