1. Phases One of the different shapes of the moon as seen from the earth. 1

2. Moon A natural satellite of earth. 2

3. Sun The star at the center of the solar system 3

4. Earth The third planet from the sun and the largest of the terrestrial planets in the solar system in diameter, mass, and density. 4

5. Eclipses The partial or total blocking of one object in space by another 5

6. Tides The daily rise and fall of earth’s waters on it’s coastlines. 6

7. Hemispheres One half of the sphere that makes up the earth’s surface. 7

8. Tilt The leaning of the earth’s imaginary axis at 23.5 degrees off of vertical. 8

9. Axis An imaginary line that passes through earth’s center and the north and south poles, about which the earth rotates. 9

10. Revolution The movement of an object around another object. 10

11. Rotation The spinning motion of a planet on its axis. 11

12. Constellations patterns of stars in the sky. 12

13. Solar System The sun and the bodies that revolve around it. 13

14. Galaxy A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity. 14

15. Universe All of space and everything in it. 15

16. Solar Eclipse The blocking of sunlight to the earth that occurs when the moon is directly between the sun and the earth. 16

17. Lunar Eclipse The blocking of sunlight to the moon that occurs when the earth is directly between the sun and the moon. 17

18. Umbra The darkest part of a shadow. 18

19. Penumbra The part of the shadow that surrounds the umbra. 19

20. Waxing The phase of the moon during which the visible. 20

21. Waning The phase of the moon in which the size of its visible portion is decreasing. 21

22. Crescent When the moon resembles the letter “C” or the letter “C” backwards. 22

23. Gibbous Almost a full moon; approximately 90% illuminated. 23