ASTRONOMY

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Across
  1. 2. Greek for “Circle of Animals”
  2. 5. Event where the sun is directly overhead at noon as seen from Earth’s equator
  3. 7. One of Jupiter’s Moons
  4. 8. Star ending its life in a huge explosion
  5. 10. Ionization trail produced by meteoroid as it enters the Earth’s atmosphere
  6. 16. Changing illumination of the Moon over time
  7. 17. Seventh sign of the zodiac symbolized by scales or balance
  8. 18. Point on the sky that is directly overhead
  9. 19. Vast collection of stars, gas and dust
  10. 20. Scientific Study of the Celestial Objects and their Phenomena
Down
  1. 1. Benefic Fixed Star in the 10th degree of Sagittarius; One of the four royal stars
  2. 3. Largest planet in the Solar System
  3. 4. Grouping of Stars
  4. 6. Event when the Sun reaches its maximum declination
  5. 9. Study of stars
  6. 11. Means “moon”
  7. 12. Dirty snowball of ice and rocky debris
  8. 13. Event that occurs when the shadow of a planet or moon falls upon a second body
  9. 14. Region of indistinct nebulosity
  10. 15. Galaxy where the Solar System belongs