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4. - the relative size of things
5. - 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
6. - a planet outside our solar system
10. Moon - a moon phase that looks like a full circle from Earth
12. - something we observe to be similar over and over again
14. - to shine light on an object and make it visible
15. Pull - the force that pulls two objects together due to their mass
17. Moon - a moon phase where the Moon is not visible from the Earth
18. - a collection of gas, dust, stars, and solar systems that are held together by gravity
19. - a rocky sphere that travels around a planet

1. - the tendency of an object to remain at rest or unchanged
2. Moon - a moon phase that looks like half a circle from Earth
3. Moon - a moon phase that looks like less than half a circle from Earth
7. - the nearly circular path a smaller object (like the Moon) travels around a larger object like Earth)
8. - a moon outside our solar system
9. - the force by which all things with mass or energy (including planets, stars, galaxies, and light) are brought towards one another
11. Eclipse - when the moon is completely dark
13. Phase - the shape of the illuminated part of the Moon as it appears from Earth
16. - the circular movement of an object around its center (like a top spinning)
18. Moon - a moon phase that looks like more than a half circle from Earth