Astronomy Basics Quiz Prep 1

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Across
  1. 4. First to come up with an explanation of retrograde motion.
  2. 6. Time to orbit the galaxy.
  3. 11. When a planet appears to move backwards.
  4. 12. Distance light travels in a year.
  5. 14. Belief that stars do magical things to people.
  6. 15. All of the superclusters together.
  7. 16. A bunch of star systems orbiting each other.
  8. 18. A device that lets you see back in time.
  9. 20. Although based on the moon, these don't actually align with moon orbits.
  10. 21. 365.25 days.
  11. 22. First to come up with elliptical orbits.
Down
  1. 1. First to put the Sun at the center of the solar system.
  2. 2. A bunch of galaxies near each.
  3. 3. A bunch of local groups together.
  4. 5. Beginning of cosmic calendar.
  5. 7. Planets and a star.
  6. 8. Study of stars.
  7. 9. On the cosmic calendar, Earth's birth month.
  8. 10. Sphere orbiting star.
  9. 13. Just under 24 hours.
  10. 17. Distance from Sun to Earth.
  11. 19. A little over 3 lightyears.