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  | | Our solar system | | | Our solar system |
  | | Our solar system is really, really big! | | | Our solar system is really, really big! |
  | | It is also very, very old. | | | It is also very, very old. |
  | | Scientists think our solar system is about 5 billion years old. | | | Scientists think our solar system is about 5 billion years old. |
  | | Scientists who study our solar system are called astronomers. | | | Scientists who study our solar system are called astronomers. |
  | | People who explore the solar system are called astronauts. | | | People who explore the solar system are called astronauts. |
  | | Astronomers and astronauts help us to learn about our solar system. | | | Astronomers and astronauts help us to learn about our solar system. |
  | | Our solar system is made up of the Sun and 9 planets. | | | Our solar system is made up of the Sun and 9 planets. |
  | | There are also moons, comets, and asteroids. | | | There are also moons, comets, and asteroids. |
  | | Most of our solar system is empty space filled with gas and dust. | | | Most of our solar system is empty space filled with gas and dust. |
  | | The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. | | | The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. |
  | | Some of the planets have moons. | | | Some of the planets have moons. |
  | | Saturn has 3 rings. | | | Saturn has 3 rings. |
  | | The planets orbit around the sun. | | | The planets orbit around the sun. |
  | | The moons orbit around their planets. | | | The moons orbit around their planets. |
  | | In drawings the planets look very close to each other. | | | In drawings the planets look very close to each other. |
  | | They aren't! | | | They aren't! |
  | | They are very, very, far away from each other. | | | They are very, very, far away from each other. |
| | solar system | | | solar system |
| | astronomer | | | astronomer |
| | comet | | | comet |
| | asteroid | | | asteroid |
  | | planet | | | planet |
| | Mercury | | | Mercury |
| | Venus | | | Venus |
| | Mars | | | Mars |
| | Jupiter | | | Jupiter |
| | Saturn | | | Saturn |
| | Uranus | | | Uranus |
| | Neptune | | | Neptune |
| | Pluto | | | Pluto |
| | moon | | | moon |
| | sun | | | sun |
| | Earth | | | Earth |
| | star | | | star |