Ch 1 Intro to Astronomy Vocabulary

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Across
  1. 3. the study of objects beyond Earth and how they interact
  2. 4. oval shape of planetary orbit
  3. 5. an object that orbits a star but has not cleared the path of other objects
  4. 8. a.k.a. longitude
  5. 9. a science rule that has never been disproven
  6. 13. the distance from the Earth to the Sun
  7. 14. the distance light travels in one year
  8. 16. the movement of one object around another
  9. 17. the unit of distance most used by astronomers
Down
  1. 1. patterns seen in groups of stars in the sky
  2. 2. a collection of dust, gas, stars & planets
  3. 4. invented to try to explain retrograde motion
  4. 6. Greek who calculated the radius of the Earth
  5. 7. belief that the Earth is the center of everything
  6. 10. giant balls of hot plasma that give off radiation
  7. 11. the point in the sky directly overhead
  8. 12. how high an object is above the horizon
  9. 15. the direction pointed in the sky measured in degrees