EMS vocab

2. when the moon is completely dark
5. a moon phase that looks like a half-circle from earth
9. the nearly circular path a smaller object travels around a larger object
10. a moon outside our solar system
11. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
16. the shape of the illuminated part of the moon as it appears from earth
17. a moon phase that looks like less than a half circle from earth
19. the border between light and dark on the moon

1. a planet outside our solar system
3. a moon phase that looks like a full circle from earth
4. the star that is the main source of light at the center of our solar system
6. a moon phase in which the moon isn't visible from earth
7. a moon phase that looks like more than a half circle from earth
8. something we observe to be Similar over and over again
12. the relative size of things
13. the sun, the planets that orbit the sun, and other objects that orbit the sun
14. to shine light on an object and make it visible
15. a rocky sphere that travels around a planet
18. the amount of time it takes for a planet to complete one orbit around a star or stars