|   | English |   |   | Greek/?translate=Vietnamese |   |
  | ![sound](/images/general/playSound.png) | Our solar system | | ![sound](/images/general/playSound.png) | Our solar system |
  | ![sound](/images/general/playSound.png) | Our solar system is really, really big! | | ![sound](/images/general/playSound.png) | Our solar system is really, really big! |
  | ![sound](/images/general/playSound.png) | It is also very, very old. | | ![sound](/images/general/playSound.png) | It is also very, very old. |
  | ![sound](/images/general/playSound.png) | Scientists think our solar system is about 5 billion years old. | | ![sound](/images/general/playSound.png) | Scientists think our solar system is about 5 billion years old. |
  | ![sound](/images/general/playSound.png) | Scientists who study our solar system are called astronomers. | | ![sound](/images/general/playSound.png) | Scientists who study our solar system are called astronomers. |
  | ![sound](/images/general/playSound.png) | People who explore the solar system are called astronauts. | | ![sound](/images/general/playSound.png) | People who explore the solar system are called astronauts. |
  | ![sound](/images/general/playSound.png) | Astronomers and astronauts help us to learn about our solar system. | | ![sound](/images/general/playSound.png) | Astronomers and astronauts help us to learn about our solar system. |
  | ![sound](/images/general/playSound.png) | Our solar system is made up of the Sun and 9 planets. | | ![sound](/images/general/playSound.png) | Our solar system is made up of the Sun and 9 planets. |
  | ![sound](/images/general/playSound.png) | There are also moons, comets, and asteroids. | | ![sound](/images/general/playSound.png) | There are also moons, comets, and asteroids. |
  | ![sound](/images/general/playSound.png) | Most of our solar system is empty space filled with gas and dust. | | ![sound](/images/general/playSound.png) | Most of our solar system is empty space filled with gas and dust. |
  | ![sound](/images/general/playSound.png) | The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. | | ![sound](/images/general/playSound.png) | The planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. |
  | ![sound](/images/general/playSound.png) | Some of the planets have moons. | | ![sound](/images/general/playSound.png) | Some of the planets have moons. |
  | ![sound](/images/general/playSound.png) | Saturn has 3 rings. | | ![sound](/images/general/playSound.png) | Saturn has 3 rings. |
  | ![sound](/images/general/playSound.png) | The planets orbit around the sun. | | ![sound](/images/general/playSound.png) | The planets orbit around the sun. |
  | ![sound](/images/general/playSound.png) | The moons orbit around their planets. | | ![sound](/images/general/playSound.png) | The moons orbit around their planets. |
  | ![sound](/images/general/playSound.png) | In drawings the planets look very close to each other. | | ![sound](/images/general/playSound.png) | In drawings the planets look very close to each other. |
  | ![sound](/images/general/playSound.png) | They aren't! | | ![sound](/images/general/playSound.png) | They aren't! |
  | ![sound](/images/general/playSound.png) | They are very, very, far away from each other. | | ![sound](/images/general/playSound.png) | They are very, very, far away from each other. |
![solar system solar system](/images/vocabulary/N1364s.png) | ![sound](/images/general/playSound.png) | solar system | | ![sound](/images/general/playSound.png) | solar system |
![astronomer astronomer](/images/vocabulary/N1365s.png) | ![sound](/images/general/playSound.png) | astronomer | | ![sound](/images/general/playSound.png) | astronomer |
![comet comet](/images/vocabulary/N1366s.png) | ![sound](/images/general/playSound.png) | comet | | ![sound](/images/general/playSound.png) | comet |
![asteroid asteroid](/images/vocabulary/N1367s.png) | ![sound](/images/general/playSound.png) | asteroid | | ![sound](/images/general/playSound.png) | asteroid |
  | ![sound](/images/general/playSound.png) | planet | | ![sound](/images/general/playSound.png) | planet |
![Mercury Mercury](/images/vocabulary/N1369s.png) | ![sound](/images/general/playSound.png) | Mercury | | ![sound](/images/general/playSound.png) | Mercury |
![Venus Venus](/images/vocabulary/N1370s.png) | ![sound](/images/general/playSound.png) | Venus | | ![sound](/images/general/playSound.png) | Venus |
![Mars Mars](/images/vocabulary/N1371s.png) | ![sound](/images/general/playSound.png) | Mars | | ![sound](/images/general/playSound.png) | Mars |
![Jupiter Jupiter](/images/vocabulary/N1372s.png) | ![sound](/images/general/playSound.png) | Jupiter | | ![sound](/images/general/playSound.png) | Jupiter |
![Saturn Saturn](/images/vocabulary/N1373s.png) | ![sound](/images/general/playSound.png) | Saturn | | ![sound](/images/general/playSound.png) | Saturn |
![Uranus Uranus](/images/vocabulary/N1374s.png) | ![sound](/images/general/playSound.png) | Uranus | | ![sound](/images/general/playSound.png) | Uranus |
![Neptune Neptune](/images/vocabulary/N1375s.png) | ![sound](/images/general/playSound.png) | Neptune | | ![sound](/images/general/playSound.png) | Neptune |
![Pluto Pluto](/images/vocabulary/N1376s.png) | ![sound](/images/general/playSound.png) | Pluto | | ![sound](/images/general/playSound.png) | Pluto |
![moon moon](/images/vocabulary/N213s.png) | ![sound](/images/general/playSound.png) | moon | | ![sound](/images/general/playSound.png) | moon |
![sun sun](/images/vocabulary/N266s.png) | ![sound](/images/general/playSound.png) | sun | | ![sound](/images/general/playSound.png) | sun |
![Earth Earth](/images/vocabulary/N273s.png) | ![sound](/images/general/playSound.png) | Earth | | ![sound](/images/general/playSound.png) | Earth |
![star star](/images/vocabulary/N524s.png) | ![sound](/images/general/playSound.png) | star | | ![sound](/images/general/playSound.png) | star |