| A | B |
|---|
| Orbit | The path of a celestial body as it moves through space |
| Ozone | A molecule consisting of three atoms of oxygen |
| Phase | The apparent change in shape of the Moon and inner planets as seen from Earth as they move in their orbits |
| Planet | A celestial body orbiting a star or stellar remnant that is massive enough to be rounded by its own gravity. |
| Quasar | An unusually bright object found in the remote areas of the universe. |
| Solar | Of or relating to the Sun |
| Photosphere | The bright visible surface of the Sun |
| Red Giant | A stage in the life of a star when the fuel begins to exhaust and the star expands to about fifty times its normal size. |
| Red Shift | A shift in the lines of an object's spectrum toward the red end. |
| Rays | Each of the lines in which light (and heat) may seem to stream from the sun or any luminous body. |
| Revolve | To move in a curved path around a center or axis |
| Rotate | The spin of a body around its axis. |
| Satellite | A natural or artificial body in orbit around a planet |
| Solar Flare | A bright eruption of gas from the Sun's photosphere |
| Solstice | The time of the year when the Sun appears furthest north or south of the celestial equator. |
| Space | The region beyond the Earth's atmosphere containing the other planets of the solar system, stars, galaxies, etc |
| Star | A celestial body of hot gases that releases energy produced by thermonuclear reactions in the interior. |
| Sunspot | Areas of the Sun's surface that are cooler than surrounding areas. |
| Super Nova | An explosion that happens when a massive star uses up its fuel and ends its life. |
