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We need light to see. Light can come from many different sources, such as the Sun, stars, torches, lamps and candles. Some sources of light are so powerful that they can damage our eyes if we directly look at it. That's why we often need sunglasses.

Light travels faster than anything in the universe and it always travels in straight lines.

Some animals are sources of light such as fireflies and glow worms.

A chemical reaction happens inside fireflies and this helps them to light up!

Have a look around wherever you are right now.

• How many sources of light can you see?
• Draw a source of light that you can see.
• Try to explain how this source gives off light.

Does it use electricity? Is it on fire, like the Sun?