Comets

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Across
  1. 2. Surrounds the nucleus of a comet
  2. 6. A comet that appears once or twice in a person's lifetime
  3. 7. A sphere surrounding our solar system
  4. 8. The tail of gas from a comet
Down
  1. 1. A comet that appears every couple hundred years
  2. 3. The most popular comet we can see from the earth every 76 years
  3. 4. The tail of particles from a comet
  4. 5. Circles around our solar system
  5. 9. Solid, central part of a comet