Across
- 2. the relative size of things
- 6. to shine light on an object and make it visible
- 7. the nearly circular path a smaller object (like the Moon) travels around a larger object (like Earth)
- 9. the star that is the main source of light at the center of our solar system
- 13. a moon outside our solar system
- 14. the amount of time it takes for a planet to complete one orbit around a star or stars
- 16. system the sun, the planets that orbit the sun, and other objects that orbit the sun
- 17. eclipse when the Moon is completely dark
- 19. an object, diagram, or computer program that helps us
Down
- 1. moon A moon phase that looks like less than a half circle from Earth
- 3. moon a moon phase that looks like a full circle from Earth
- 4. moon A moon phase that looks like more than a half circle from Earth
- 5. something we observe to be similar over and over again
- 8. the border between light and dark on the Moon
- 10. something by making it simpler or easier to see
- 11. a rocky sphere that travels around a planet
- 12. phase the shape of the illuminated part of the Moon as it appears from Earth
- 15. moon a moon phase that looks like half a circle from Earth
- 18. a planet outside our solar system