Key+words

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Here are some **key words** and **definitions** which may be useful when researching this topic. These terms and definitions will help you understand the topic better and assist you to find the information that you need. =====

**SOLAR SYSTEM**

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The **Solar System** is the sun and everything that revolves around it. It includes planets, moons and other space objects such as comets, asteroids and meteors. =====

**SUN** The **sun** is actually a small star which exists almost entirely of burning gas. It produces light and heat which enables life on earth to survive. **PLANET**

There are eight **planets** that orbit the sun. The planets in our solar system are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Until recently Pluto was also classified as a planet!

**EARTH** **Earth** is the only planet in our Solar System that has animals and plants living on it. All living things need water to survive and Earth is the only planet that has water.

**MOON** The **moon** is Earth's closest neighbour but is isn't a planet. The **moon** orbits the earth just like the planets orbit the sun. Did you know that many other planets have moons as well?

**STARS**

A **star** is a massive ball of hot gas. Stars look small because they are so far from earth. Lots of stars together form a galaxy!

‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍**WANT TO LEARN MORE?**  Try these other **key words** to further your investigation. Space, NASA (National Aeronautics and Space Administration), galaxy, astronaut.