Semester 2 Final

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Across
  1. 4. a group of single stars, star systems, star clusters, gas and dust
  2. 5. a dark patch on the sun as a result of intense magnetic fields
  3. 9. the idea that the sun is at the center of the solar system
  4. 10. the distance light travels in one year
  5. 14. the spinning of an object around its axis. the earth does this once per day
  6. 16. a streak of light produced when a small rock passes through our atmosphere
  7. 17. the force that attracts all objects towards each other
  8. 18. an explosion of an extremely massive star
  9. 19. the color of the coldest stars in the universe
  10. 20. the imaginary line the earth rotates on
  11. 22. a large mass of ice and rock that creates a tail when it gets close to the sun
  12. 25. the first phase in the formation of a new star
  13. 27. much like the earth, the sun also has
  14. 31. the month in which the earth is closest to the sun
  15. 32. this scientists created the law of universal gravitation
  16. 33. a patter or group of stars that people imagine represents an figure, animal or object
  17. 38. the darkest part of the shadow cast by an object
  18. 40. the name of the "explosion" that began the universe
  19. 42. the shape of our galaxy
  20. 43. the movement of an object around another object. The Earth does this once per year
  21. 47. something that orbits a planet
  22. 48. the color of the hottest stars in the universe
  23. 49. the apparent motion of an object against its background
  24. 50. energy that travels through space in the form of waves is called ____________ radiation
Down
  1. 1. an object that collects electromagnetic radiation and focuses it
  2. 2. the different shapes the moon takes as it orbits the Earth
  3. 3. all of space and everything in it
  4. 6. what our sun will eventually become
  5. 7. an object that orbits the sun, is spherical and has cleared its orbital path of debris
  6. 8. when the earth is at its strongest tilt towards the sun in either hemisphere
  7. 11. this type of eclipse occurs when the Earth is positioned between the moon and the sun
  8. 12. the tendency of an object to resist a change in motion
  9. 13. the idea that the earth is at the center of the solar system
  10. 15. this is the kind of radiation that our eyes can perceive
  11. 18. system contains the sun, the planets, their moons and a variety of other objects
  12. 21. this unit is the average distance between the Earth and the sun
  13. 23. the path an object takes as it revolves around another object
  14. 24. the name of a star system that has two stars
  15. 26. the number of times the moon rotates and revolves in about 28 days
  16. 28. a giant ball of superheated gas made mostly of hydrogen and helium
  17. 29. this object in our solar system contains 99.85% of all matter
  18. 30. all objects orbit in this shape, not a perfect circle
  19. 34. this type of eclipse occurs when the moon is positioned between the sun and the earth
  20. 35. the name of the program that landed men on the moon
  21. 36. the rise and fall of ocean water as a result of the moons gravity
  22. 37. the largest planet in the solar system
  23. 39. an object that has so much gravity, not even light can escapes its pull
  24. 41. this kind of tide only occurs when the suns gravity counteracts the moons gravity
  25. 44. a region of space where new stars are formed
  26. 45. the distance between the peak of one wave and the peak of another
  27. 46. the name of the star directly above out north pole