astronomy

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Across
  1. 7. – Ancient Greek who first suggested Earth is round
  2. 8. – Galaxy we live in
  3. 9. – Earth-centered model of the universe
  4. 11. – The study of stars, planets, and the universe
  5. 13. – Scientist who proposed the heliocentric model
  6. 15. – Distance light travels in a year
  7. 17. – Star at the center of our solar system
  8. 18. – Path followed by a planet around a star
  9. 19. – Star pattern that forms a shape in the sky
Down
  1. 1. – Region beyond Neptune filled with icy objects
  2. 2. – First person on the Moon
  3. 3. – Swirling group of stars, gas, and dust
  4. 4. – Sun-centered model of the solar system
  5. 5. – First scientist to use a telescope for astronomy
  6. 6. – Red planet in our solar system
  7. 8. – Natural satellite of Earth
  8. 10. – Small icy body with a tail when near the sun
  9. 12. – Bright streak in the sky from a space rock burning
  10. 14. – Bright object that orbits a star and reflects its light
  11. 16. – Telescope launched in 1990, still in use today