Earth, Moon, Sun Terms

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Across
  1. 2. the border between light and dark on the Moon
  2. 3. a force that attracts object toward one another
  3. 8. a planet outside our solar system
  4. 10. a feature that forms on a surface of a planet such as a channel, crater, or volcano
  5. 11. the star that is the main source of light at the center of our solar system
  6. 13. something we observe to be similar over and over again
  7. 16. - when the moon casts a shadow on the Earth caused by perfect alignment of the Earth, moon, and the Sun
  8. 21. - the sun, the planets that orbit the sun, and other objects that orbit the sun
  9. 22. a moon that looks like a full circle from Earth
  10. 23. a moon phase in which the Moon is not visible from Earth
  11. 24. the nearly circular path a smaller object (like the Moon) travels around a larger object (like Earth)
Down
  1. 1. an object that moves around a larger object
  2. 3. a moon phase that looks like more than half a circle from Earth
  3. 4. a rocky sphere that travels around a planet
  4. 5. to shine light on an object and make it visible
  5. 6. a measurement of the gravitational force of an object depending on mass and location
  6. 7. the amount of time it takes for a planet to complete one orbit around a star or stars
  7. 9. when the Moon is completely dark
  8. 12. the shape of the illuminated part of the Moon as it appears from Earth
  9. 14. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
  10. 15. a measure of the amount of matter in an object
  11. 17. a moon outside our solar system
  12. 18. the relative size of things
  13. 19. moon a moon phase that looks like less than half of a circle from Earth
  14. 20. a moon phase that looks like a half-circle from Earth