Earth's motions & space crossword

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Across
  1. 2. an imaginary line drawn around the earth that divides the earth into northern and southern hemispheres
  2. 3. a huge system of millions or billions of stars, together with gas and dust, held together by gravity
  3. 8. the spiral-shaped galaxy in which we live
  4. 10. the massive expansion of an extremely small, dense and hot bit of matter- the most widely accepted theory of the origin of the universe
  5. 11. the shortest day of the year (least daylight)
  6. 12. the longest day of the year (most daylight)
  7. 15. the path an object, such as a planet, takes as it revolves around another object
  8. 17. all of space and everything in it
  9. 18. light from objects moving away from us in space will shift towards the red end of the visible light spectrum
  10. 21. the day in the spring when everyone on earth experiences equal day and night (12 hours of each)
  11. 22. tide with the least amount of difference between high and low tide
  12. 23. tide in which the difference between high and low tide is the greatest
  13. 25. the explosion of a dying high-mass star
  14. 26. moon phases where there is an decreasing amount of visible light on the moon's surface (light on the left)
Down
  1. 1. consists of a star and everything that orbits that star
  2. 4. the distance light travels in one year (about 5.88 trillion miles)
  3. 5. moon phases where there is an increasing amount of visible light on the moon's surface (light on the right)
  4. 6. when the ocean water is at its lowest level during an approximately 12 hour period
  5. 7. a huge cloud of dust and gas in space held together by gravity
  6. 9. the motion of one object moving completely around another in an orbit
  7. 10. a region of space having a gravitational field so intense that no matter or radiation can escape
  8. 13. moon phases where more than half of the side of the moon facing earth is visible (may be waxing or waning)
  9. 14. moon phase where no reflected light from the sun is visible on earth
  10. 16. the rising and falling of the ocean's surface
  11. 19. a huge burning sphere of gas fueled by nuclear fusion
  12. 20. moon phase where the side of the moon facing earth is completely visible (100% illuminated)
  13. 24. turning or spinning on an axis