Northern Ireland Key Stage 4

An Orrery is a moving, mechanical model of the Solar System. It shows how all of the planets orbit around the Sun.

A satellite is an object which orbits another. An orbit is the curved path that an object in space takes around another object.

You have likely heard about the Universe expanding. Or that redshift can tell us about the movements of galaxies. Both are difficult ideas to imagine and understand.

Ever wondered how heavy or light you would feel on another planet in our Solar System?