Other Members of the Solar System

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Across
  1. 4. Forms behind comets when it is close to the sun
  2. 7. A cloud of icy planetesimals
  3. 8. Long line of asteroids that lies between Mars and Jupiter
  4. 10. When several meteors enter Earth's atmosphere at the same time
  5. 11. The distance from the sun to the Oort Cloud
  6. 12. A meteor after it has collided with Earth's surface
  7. 15. One of the frozen gases in the nucleus of a comet, has the chemical formula CO
  8. 18. Orbits the sun but is not a planet due to size or not being spherical
  9. 19. The abbreviation for Trans-Neptunian objects
  10. 21. The center of a comet
  11. 23. One of the frozen gases in the nucleus of a comet, has the chemical formula CH4
  12. 25. The most visible part of a comet
  13. 26. The area of space beyond the orbit of Neptune
  14. 27. One of the frozen gases in the nucleus of a comet, has the chemical formula CO2
  15. 28. The time it takes for Halley's comet to pass Earth's orbit
  16. 29. The distance from the sun to the Kuiper Belt
  17. 30. Another name for comets
Down
  1. 1. Large asteroids might have these
  2. 2. The direction a comet's tail will face
  3. 3. The tail of comets is formed from this
  4. 5. Objects that orbit the sun at a farther distance than Neptune
  5. 6. Objects made of ice and a rocky core with two tails
  6. 9. The range of the center of a comet
  7. 13. A small, rocky object from space that is heated as it enters Earth's atmosphere
  8. 14. One of the most famous comets
  9. 16. The eighth planet in the solar system
  10. 17. Something an asteroid lacks
  11. 20. The type of orbit comets have
  12. 22. A meteor before it has entered Earth's atmosphere
  13. 24. One of the frozen gases in the nucleus of a comet, has the chemical formula NH3