| A | B |
|---|
| Light Year | The distance light travels in a year. |
| Nebula | A cloud of gas and dust |
| Galaxy | A huge system of stars and gas held together by gravity |
| Constellation | A group of stars that form a pattern. |
| Rotation | One complete spin on an axis. |
| Revolution | Movement around another object. |
| Supernova | An exploding star. |
| Black Hole | A point in space that has the strongest gravitational force. |
| Star | A huge ball of hot gas. |
| Corona | The outermost layer of the Sun. |
| Photosphere | The layer of the Sun that gives off the light that we see. |
| Chromosphere | The layer above the photosphere. |
| Prominences | Loops of blazing gas leaping out of the chromosphere. |
| Solar Flare | An eruption of the chromosphere. |
| Sunspots | Dark regions on the photosphere. |
