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