EXTRA CREDIT

3. a moon phase that looks like less than half a circle from Earth
6. The moment that the moon orbits directly between the sun and the Earth
7. the four parts of the year where weather, ecology, and number of daylight hours change as a result of Earth’s orbit around the sun
9. the star that is the main source of light at the center of our solar system
11. a moon phase that looks like half a circle from Earth
16. when the moon is completely dark
17. the tendency of an object to remain at rest or unchanged
19. something we observe to be similar over and over again
20. the moon during the phases in which the part illuminated by the sun gets larger (new moon to full moon)

1. a moon phase that looks like more than a half circle from Earth
2. a moon outside our solar system
4. a moon phase where the Moon is not visible from the Earth
5. a moon phase that looks like less than half a circle from Earth
8. the border between light and dark on the Moon
10. the sun, the planets that orbit the sun, and other objects that orbit the sun
12. the relative size of things
13. a planet outside our solar system
14. to shine light on an object and make it visible
15. the amount of time it takes for a planet to complete one orbit around a star or stars
18. a collection of gas, dust, stars, and solar systems that are held together by gravity