Vocab

3. something we observe to be similar over and over again
5. the shape or the illuminated part id the moon as it appears from earth.
7. a plannet outside our solar system.
8. when the moon is completely dark
10. the relative size of things
11. a rocky sphere that travels around a planet.
12. the nearly circular path a smaller object travels around a light object.
14. a moon out side our solar system
16. amount of time it takes for a planet to make it around a star or stars
17. an object, diagram, or computer program that helps us understand something by making it simpler and easier to see.
18. the star that is the main source of light at the center of our solar system
19. a moon phase that looks like more than half of a circle from earth

1. a moon phase in which the moon is not visible from earth.
2. a moon phase that looks like half-circle from earth
4. a moon phase that looks like less than half of a circle from earth
6. the sun, the planets that orbit the sun, and other objects that orbit the sun
9. to shine light on an object and make it visible
13. the border between light and dark on the moon
15. a moon phase that looks like a full circle from earth