Earth Moon and Sun Terms

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