Space Crossword

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Across
  1. 2. when the Earth, Moon & Sun are in perfect alignment
  2. 5. force of attraction between objects that is due to their masses
  3. 6. path of an object as it revolves around another object in space
  4. 8. all of the large and small objects that orbit the sun (2 words)
  5. 9. scientist provided first evidence of expanding universe (2 words)
  6. 10. space and all of the matter and energy in it
  7. 13. 5.1° (2 words)
  8. 14. seasons are caused by the Earth’s …
  9. 16. Sun and Moon gravitational forces partially cancel out, resulting in small tides (2 words)
  10. 17. Sun and Moon gravitational forces work together, resulting in large tides (2 words)
Down
  1. 1. collection of stars, gas, and dust that is held together by gravity
  2. 2. day when the sun crosses the equator
  3. 3. different apparent shapes of the moon that repeat over 29.5 days
  4. 4. on average, every planet’s closest planetary neighbor
  5. 7. day and night are caused by …
  6. 9. 23.5° (2 words)
  7. 11. day when the sun is as far north or south of the equator as possible
  8. 12. universe is getting bigger
  9. 15. years are caused by …