| A | B |
|---|
| Aurora | A glow in the night sky produced by particles from the solar wind interacting with Earth's magnetic field. |
| Chromosphere | Inner layer of the sun's atmosphere. |
| Corona | Outermost layer of the sun's atmosphere. |
| Fusion | The combining of the nuclei of lighter elements to make heavier elements. |
| Geocentric model | A model of the solar system that has Earth at the center. |
| Gravitation | The force of attraction between any two objects with mass. |
| Heliocentric model | A model of the solar system that has the sun at the center. |
| Photosphere | The visible surface of the sun. |
| Plasma | A state of matter consisting of charged particles, (+) ions and (-) electrons. |
| Solar wind | Constant stream of electrically charged particles that are blown from the sun in all directions. |
| Sun spot | Dark areas on the sun's photosphere that result from variations in the sun's magnetic field. |
