Bitesize has changed! We're updating subjects as fast as we can. Visit our new site to find Bitesize guides and clips - and tell us what you think!


Gravity, force and weight


Gravity is a force that attracts objects towards each other. Any object with mass exerts a force of gravity. The greater the mass, the greater the force. The force of gravity between two objects decreases as the objects move further apart.

The force of gravity is not very noticeable unless one of the objects – such as the Earth or the Sun – has a huge mass.

Earth in space, surrounded by arrows pointing inwards showing the direction of gravity

Gravity attracts objects towards the centre of the Earth


  • pulls objects on Earth towards the centre of the planet
  • holds the Earth's atmosphere in place
  • holds all the components of the solar system in orbit around the Sun
  • holds all the components of the galaxy together

Back to Space and its mysteries index

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.