Earth-Sun-Moon

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Across
  1. 1. the star that is the main source of light at the center of our solar system
  2. 2. a space object that orbits around another object
  3. 4. the relative size of things
  4. 7. the force exerted from one object of mass to another object of mass
  5. 10. a massive object that has such high gravitational force that nothing can escape
  6. 11. when the moon is becoming less and less illuminated over time
  7. 14. a division of time marked by similar weather and sunlight hours
  8. 16. to move in a circle around a central object, such as a star
  9. 18. to move in a circular motion, spinning
  10. 21. to shine light on an object and make it visible
  11. 22. the cyclical change of water levels on Earth
Down
  1. 1. the sun, the planets that orbit the sun, and other objects that orbit the sun
  2. 3. when the moon is becoming more and more illuminated over time
  3. 5. a collection of dust, planets, stars, and moons held together by gravity
  4. 6. a rock sphere that travels around a planet
  5. 8. the amount of time it takes for a planet to complete one orbit around a star or stars
  6. 9. when an object blocks out another object (eg. lunar, solar)
  7. 12. an imaginary line that an object rotates or revolves around
  8. 13. the time it takes for the Moon to orbit around the Earth
  9. 15. the prefix for things outside of our solar system
  10. 17. the nearly circular path a smaller object travels around a larger object
  11. 19. to be off of one’s natural rotation axis, measured in degrees
  12. 20. a space object that orbits around a star