Side B

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Across
  1. 2. the point directly overhead
  2. 5. two words; this stripped away atmosphere of Mars
  3. 7. greek astronomer who introduced magnitude
  4. 8. apparent backward motion
  5. 12. came up with laws of planetary motion
  6. 14. archer constellation
  7. 15. two words; northern lights
  8. 16. two words; a black hole has this
  9. 17. constellation. contains tarantula nebula.
  10. 21. zero line for longitude
  11. 22. caused by meteorites
  12. 24. saturn is famous for these
  13. 25. two words; common end product of stellar evolution
  14. 26. source of power in stars
  15. 27. nodding motion
  16. 29. popularized the apparrent paradox of why the night sky is not bright
  17. 30. two words; diameter of light shaft exiting an eyepiece
  18. 32. north-south arc in the sky; the M in AM/PM
  19. 33. a moon of mars
  20. 35. the moon’s gravity causes these on earth
Down
  1. 1. largest moon in the solar system
  2. 3. occurs in between solstices
  3. 4. a point of infinite density and zero volume
  4. 6. such charges produce EM waves
  5. 9. apparent to-and-fro motion of the moon’s face
  6. 10. Greek astronomer. Measured the circumference of the Earth.
  7. 11. also called ‘oligarchs’ because they controll their surroundings
  8. 13. two words; final phase of Solar System’s formation
  9. 18. two words; our sun is here on the HR diagram
  10. 19. two words; ‘line of sight’ double stars
  11. 20. equation that estimates the number of extraterrestrial civilizations in the galaxy
  12. 23. two words; average sun-earth distance
  13. 28. huge, gravitationally bound cluster of stars, dust, gas
  14. 31. common name for M101
  15. 34. famous constellation. hunter.