| A | B |
|---|
| axis | the imaginary line on which the Earth spins |
| Apollo Missions | The Apollo program was designed to land humans on the Moon and bring them safely back to Earth |
| Earth | the third planet from the sun; supports life (93 million miles away from the sun) |
| lunar eclipse | when the Earth moves between the sun and the moon (A shadow is cast on the moon.) |
| moon | a small, rocky, natural satellite that revolves around the Earth (1/4 the size of the Earth) |
| NASA | National Aeronautics and Space Administration |
| orbit | the path an object in space follows as it revolves around another object |
| phases of the moon | a pattern that repeats itself every 29 1/3 days |
| revolution | one full orbit (circle) around another object |
| rotation | the spinning motion of an object on its axis (like a top) |
| solar eclipse | when the moon moves between the Earth and the sun (A shadow is cast on the Earth.) |
| sun | a yellow, average-size star at the center of our solar system that produces heat and light (110 times the diameter of the Earth) |
| waning | a term used to describe the moon reflecting less light (seems to grow smaller) |
| waxing | a term used to describe the moon reflecting more light (seems to grow larger) |
