University of Edinburgh

BSL Physics Glossary - planet - definition

A planet is an object which orbits round a star. Our Sun has a lot of planets. Earth, where we live, is the third planet out from the Sun. Further out there are more. There are nine altogether in our solar system. The Sun provides us with heat and light. We receive light directly from the sun, or reflected, e.g. from the moon. Planets don't create light.