Planetary Science (Unit 4) Vocab

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Across
  1. 2. the straight, unimpeded path taken by light from an object to an eye (IG)
  2. 3. weak tides caused by the moon and the sun being at a right angle to each other with respect to the Earth
  3. 6. the reference star pointed to by Earth’s North Pole (SRB, IG)
  4. 8. an object’s position relative to other objects (IG)
  5. 11. traveling around an object(SRB, IG)
  6. 13. when the Moon passes exactly between Earth and the Sun (SRB, IG)
  7. 17. some craters (IG)
  8. 19. an imaginary axle on which a planet spins
  9. 20. a narrow beam of light from the Sun or an artificial light source; white lines that extend in all directions
  10. 21. elevation than the maria (IG)
  11. 22. the imaginary circle around Earth or a celestial object that is everywhere the same distance from the
  12. 23. the distance measured on Earth's surface east or west of the prime meridian (IG)
  13. 24. the imaginary line where the sky meets Earth or the ocean (IG)
  14. 26. the distance above Earth’s surface
  15. 27. a day of the year when the Sun’s rays shine straight down on the equator (SRB, IG)
  16. 30. the oldest exposed areas of the Moon's surface, extensively cratered, chemically different, and higher
  17. 31. the angle at which light passes through the atmosphere; measured from Earth’s surface (IG)
  18. 33. the path and length of time one object takes to travel around another object (SRB, IG)
  19. 34. the phase of the Moon that occurs when the Moon is in the direction of the Sun as seen from Earth
  20. 36. the way a light beam covers a larger area when it hits a surface at an angle (IG)
  21. 37. round structures of various sizes created by impact
Down
  1. 1. when Earth is exactly between the Moon and the Sun, and the Moon passes through Earth’s
  2. 4. the position from which a visual observation is made (IG)
  3. 5. IG)
  4. 7. the phase that occurs halfway between the new and full Moon (SRB, IG)
  5. 9. the shape of the Moon just after and just before the new Moon phase (SRB, IG)
  6. 10. the vertical distance or height above sea level (IG)
  7. 12. the collection of objects, distances, and directions used to establish the location of
  8. 14. the angular distance north or south from Earth’s equator (SRB, IG)
  9. 15. extreme variation in tides (high high tides and low low ties) caused by the moon and the sun being in alignment
  10. 16. a Moon shape that is larger than a first or third quarter Moon but smaller than a full Moon (SRB, IG)
  11. 18. the phase of the Moon that occurs when the Moon is opposite the Sun as seen from Earth (SRB, IG)
  12. 25. a structure on the Moon's surface that looks like a canyon or streambed (IG)
  13. 28. (SRB, IG)
  14. 29. when the illuminated part of the moon is getting smaller (SRB, IG)
  15. 32. large dark gray or black areas that are fairly smooth on the surface of the moon
  16. 35. when the illuminated part of the moon is getting bigger (SRB, IG)
  17. 38. spinning on an axis (SRB, IG)