| A | B |
|---|
| Planet | A celestial body that revolves around the sun and shines due to the reflection of the sun's light |
| Star | A celestial body that is fixed in space and shines due to the burning of its own gases |
| Geocentric | A description of the solar system in which Earth is the center of the solar system |
| Helocentric | A description of the solar system in which the sun is the center of the solar system |
| Terrestrial Planets | Then name given to the four inner planets due to their solid composition |
| Gas Giants | The name given to the four outer planets due to their gaseous composition |
| Comet | A ball of ice and dust whose orbit is usually a long, narrow ellipse |
| Meteor | A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere |
| Meteorite | A meteoroid that has hit Earth's surface |
| Constellation | A pattern of stars in the sky |
| Galaxy | A giant structure that contains hundreds of billions of stars |
| Universe | All of space and everything in it |
| Solar System | The sun, planets and all objects that revolve around the sun |
