8th Grade End-of-Year Review -- Space

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Across
  1. 1. the tide with the least difference between consecutive low and high tides
  2. 3. a galaxy in which the stars and gas clouds are concentrated mainly in one or more spiral arms.
  3. 6. a star and all the other objects that revolve around it
  4. 11. the standard unit that astronomers use to measure the size of stars
  5. 12. describes phases following a new moon, as more of the Moon's lighted side becomes visible
  6. 19. Solar system model based on the belief that the sun is the center of the universe
  7. 20. the time required for Earth to rotate once on its axis
  8. 21. the spinning motion of a object on its axis
  9. 24. the tide with the greatest difference between consecutive low and high tides
  10. 25. phase when the moon is located directly between the earth and sun
  11. 26. A sudden eruption of intense high-energy radiation from the sun's surface
  12. 27. line above which polar day (24 hours of daylight) and polar night (24 hours of darkness) are possible
  13. 29. the distance light travels in one year
  14. 30. an object that revolves around another object in space
  15. 31. the blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth.
  16. 32. A region of the solar system that is just beyond the orbit of Neptune and that contains small rocky bodies and dwarf planets
  17. 33. describes phases following the full moon during which the visible surface of the moon decreases
Down
  1. 2. regions close to the equator which receive direct sunlight nearly all year
  2. 4. areas of gas on the sun's surface that are cooler than the gases around them
  3. 5. A galaxy shaped like a round or flattened ball, generally containing only old stars
  4. 7. The average distance between Earth and the sun, used to measure distances in the solar system
  5. 8. A force of attraction between objects that is due to their masses.
  6. 9. the difference in levels of ocean water at high tide and low tide
  7. 10. An oval shape as opposed to a circular shape
  8. 13. A model of the universe in which Earth is at the center of the revolving planets and stars.
  9. 14. phase when the entire side facing Earth is illuminated
  10. 15. the time or date (twice each year) at which the sun crosses the celestial equator, when day and night are of equal length (about September 22 and March 20).
  11. 16. A galaxy that has an undefined shape, large numbers of young stars, and greats amounts of gas and dust
  12. 17. the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon
  13. 18. An object that orbits the sun and is spherical, but has not cleared the area of its orbit.
  14. 22. A loop of gas that protrudes from the sun's surface, linking parts of sunspot regions
  15. 23. either of the two times of the year when the sun is at its greatest distance from the celestial equator
  16. 28. the movement of an object around another object