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  |  | 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 | | | mēness |
 |  | sun | | | saule |
 |  | Earth | | | zeme |
 |  | star | | | zvaigzne |