| A | B |
|---|
| asteroid | Small, solid objects that orbit the Sun. Most asteroids in the solar system are between Mars and Jupiter. |
| astronomy | The study of the universe and its celestial bodies |
| comet | A mass of ice and dust orbiting the Sun |
| planet | A large body orbiting a star. A celestial body. |
| satellite | An object, natural or artificial, that orbits a larger object. Moons are satelittes. |
| solar system | Earth, the Moon, the Sun, and the other 7 plants and their satellites and smaller objects like asteroids and comets. |
| solar wind | The regular flow of particles from the Sun. |
| star | A huge gas sphere that ratiates light. The Sun in a star. |
| Sun | The start at the center of the solar system around which everything else orbits. |
| Terrestrial planet | One of the 4 small and rocky planets closest to the Sun: Mercury, Venus, Earth and Mars. |
