Unit 4 Planetary Science Vocab

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Across
  1. 3. the angular distance north or south from Earth’s equator
  2. 4. the straight, unimpeded path taken by light from an object to an eye
  3. 6. white lines that extend in all directions from some craters
  4. 8. when the moon is getting smaller
  5. 12. a day of the year when the Sun’s rays shine straight down on the equator
  6. 13. the dark large areas that are fairly smooth on the surface of the moon
  7. 15. a structure on the Moon's surface that looks like a canyon or streambed
  8. 16. the vertical distance or height above sea level
  9. 17. the path and length of time one object takes to travel around another object
  10. 19. round structures of various sizes with various details created by an impact
  11. 24. traveling around an object
  12. 25. a day of the year when Earth’s North Pole is leaning either toward the Sun or away from the Sun
  13. 28. the phase of the Moon that occurs when the Moon is in the direction of the Sun from Earth
  14. 29. the way a light beam covers a larger area when it hits a surface at an angle
  15. 31. when Earth is exactly between the Moon and the Sun
  16. 32. a Moon shape that is larger than a first or third quarter Moon but smaller than a full Moon
  17. 33. the circle around Earth or a celestial object that is everywhere the same distance from the poles
Down
  1. 1. the phase that occurs halfway between the full and new Moon
  2. 2. when the Moon passes exactly between Earth and the Sun
  3. 5. the shape of the Moon just after and just before the new Moon phase
  4. 7. the phase that occurs halfway between the new and full Moon
  5. 9. an imaginary axle that a planet spins on
  6. 10. the collection of objects, distances, and directions used to tell the location of an object
  7. 11. when the moon is getting bigger
  8. 14. light-colored areas on the moon with lots of rough mountains and craters
  9. 18. the phase of the Moon that occurs when the Moon is opposite the Sun as seen from Earth
  10. 20. the angle at which light passes through the atmosphere; measured from Earth’s surface
  11. 21. the position from which a visual observation is made
  12. 22. the reference star pointed to by Earth’s North Pole
  13. 23. spinning on an axis
  14. 26. the distance measured on Earth's surface east or west of the prime meridian
  15. 27. the imaginary line where the sky meets Earth or the ocean
  16. 30. the distance above Earth’s surface