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