Unit One Vocabulary

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Across
  1. 2. the rising and falling of the sea due to the attraction of the moon and sun on the earth
  2. 5. special day that happens twice a year; hours of day and night are nearly equal
  3. 9. the collection of 8 planets and their moons in orbit around the sun
  4. 10. line of latitude 23 1/2 degrees south of the equator
  5. 13. an invisible force that pulls objects toward each other
  6. 16. measures the distance north or south of the equator
  7. 18. a system of millions or billions of stars together with gas and dust held together by gravitational attraction
  8. 19. line of latitude 23 1/2 degrees north of the equator
Down
  1. 1. phase of the moon when it is more than half full but still not a full moon
  2. 3. the lighter shadowed area surrounding the darkest part of a shadow
  3. 4. an imaginary line around which an object rotates or spins
  4. 6. the envelope of gases surrounding the earth or other planets
  5. 7. special day where the sun appears to reach either the highest or lowest point in the sky for the year
  6. 8. phases of the moon when the lighted portion is on the right
  7. 11. when an object in space turns or spins in one place around an axis
  8. 12. an imaginary line drawn around the earth, dividing it into northern and southern hemispheres
  9. 14. when an object in space goes around another object in space
  10. 15. phases of the moon when the lighted portion is on the left
  11. 17. the darkest part of the shadow
  12. 20. phases of the moon when it looks like the letter "c" or a backwards "c"