the topic Comet

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Across
  1. 5. - Point in a comet's orbit nearest the sun.
  2. 6. - Comets can become __ as they approach the sun.
  3. 7. - Famous comet of the 1990s.
  4. 9. - Small particle in space.
  5. 11. - Direction opposite the sun.
  6. 13. - Famous periodic comet.
  7. 14. - Path around the sun.
Down
  1. 1. - Material in a comet's tail.
  2. 2. - Astronomical object.
  3. 3. - Informal term for a comet.
  4. 4. - Solid core of a comet.
  5. 8. - Study of celestial objects.
  6. 10. - Release of gas from a comet's nucleus.
  7. 12. - Composition of a comet.
  8. 15. - Distinctive feature of a comet.