In this KS3 Science quiz we'll take a look at the Solar System. The video will give you an idea of just how big it is!
When you look up at the sky on a clear night, you can see thousands of stars. Humans have been around for many thousands of years but it is only in the last few hundred years that we have started to understand about the universe in which we live.
Ancient civilisations noticed that there were five brighter 'stars' that moved around the sky in a strange way but had no idea about why they behaved like that. We now know these are the planets Mercury, Venus, Mars, Jupiter and Saturn. They are much closer to us than the stars and, like the Earth, they orbit our Sun. They are visible only because they reflect the Sun's light.