Science Crossword Puzzle #1

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Across
  1. 3. or easier to see
  2. 4. the shape of the illuminated part of the Moon as it appears from Earth
  3. 5. a moon phase in which the Moon is not visible from Earth
  4. 7. a rocky sphere that travels around a planet
  5. 12. the sun, the planets that orbit the sun, and other objects that orbit the sun
  6. 13. the border between light and dark on the Moon
  7. 14. a moon outside our solar system
  8. 16. a moon phase that looks like a full circle from Earth
  9. 17. when the Moon is completely dark
  10. 19. the relative size of things
  11. 20. something we observe to be similar over and over again
Down
  1. 1. an object, diagram, or computer program that helps us understand something by making it
  2. 2. moon phase that looks like less than half a circle from Earth
  3. 6. a moon phase that looks like a full circle from Earth
  4. 8. the nearly circular path a smaller object (like the Moon) travels around a larger object (like Earth)
  5. 9. a moon phase that looks like a half-circle from Earth
  6. 10. the amount of time it takes for a planet to complete one orbit around a star or stars
  7. 11. to shine light on an object and make it visible
  8. 15. the star that is the main source of light at the center of our solar system
  9. 18. a planet outside our solar system