| A | B |
|---|
| sunspots | A cooler, darker area of the sun that is cooler and darker. |
| gas giants | The planets Jupiter, Saturn, Uranus and Neptune. |
| moon | A natural satellite orbiting a planet. Earth has one. |
| phases | The cycle of varying shapes in the sunlit portion of a planet or moon. |
| planet | A body of substantial size held in orbit by the gravity of a star. |
| inner planets | Mercury, Venus, Earth and Mars |
| outer planets | Saturn, Jupiter, Uranus, Neptune and Pluto |
| asteroid | rocky bodies that form a belt between the inner and outer planets. |
| solar system | The sun and its entire family of planets and other objects. |
| universe | everything that exists |
| Janet | Character in The Magic School Bus who knew everything. |
| Ms. Frizzle | Teacher on The Magic School Bus. |
| Earth | The planet with oxygen and water. |
| Mercury | The planet with one cooler side and one hotter side. |
| Venus | The planet with yellow clouds of sulfur. |
| Mars | The red planet with iron in it. |
| Jupiter | The planet with the Great Red Spot. |
| Saturn | The planet that is so light that it could float in a bathtub. |
| Uranus | The tilted planet. |
| Neptune | This planet switches with Pluto every 288 years. |
| Pluto | This planet has a moon named Charon. |
| rotation | The Earth turns around and causese day and night. |
| revolution | The Earth goes around the sun in one year. |
