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2. the part that is a little lighter
5. The dark part of the shadow
9. the periodic rise and fall of the sea level under the gravitational pull of the moon
12. a chunk of rock or metal from space that falls through the atmosphere
16. any two bodies in the universe attract each other
17. a hole formed by impact
18. real or imaginary line on which something rotates
21. an object that orbits the earth
23. is a force which tries to pull two objects toward each other
24. movement of one object around a center or another object
25. a loose collection of ice and dust that orbits the sun
27. a part or step in a process

1. plural form of mare
3. the Sun and Moon are at right angles to the Earth
4. When the Earth moves between the sun and the moon
6. Moon passes in front of the Sun
7. a giant moving rock
8. a repeating path that one object in space takes around another
10. occur when the Moon is either new or full
11. grouping of stars that people imagine to represent a figure or object
13. an object that orbits a star
14. a system of timekeeping that defines the beginning and length and divisions of the year.
15. the act or process of moving or turning around a central point
19. the time of the year when the sun passes overhead the farthest north
20. either of the two points on the celestial sphere where the celestial equator intersects the ecliptic
22. occurs when one object in space blocks an observer from seeing another object in space
26. a ball of hot gas that undergoes nuclear fusion