The Sun and the planets
You can also find out about comets and our journey to one, the force of gravity, and our mission to Mars.
The Sun and 8 planets make up our solar system (say so-lar sis-stem). Solar means 'of the Sun or from the Sun'.
Paxi the alien tells us about the solar system
The Sun is a star. All stars in the sky are suns in different solar systems. The Sun gives us heat and light. It can do this as it is a ball of hot gas that is always on fire!
The Sun can shoot out flames that fall back into the Sun
Why does the sun shine?
The sun is in the middle of the solar system, and it is the biggest thing in the solar system. It is so big that if it were empty you would need a million planet Earths to fill it.
All planets turn and spin around the Sun.
Paxi the alien explains how the Earth spinning around the Sun makes days, nights and the seasons
Planet facts song