What is the difference between mass and matter? Gravity is the force of action between two objects. It’s called a natural force because it acts at a distance rather than needing to be in contact.

It’s wonderfully immersive stuff that forces the viewer to really ... the behind-the-scenes documentary Gravity: Mission Control, which is longer than the movie at 1 hour and 46 minutes.

Save guides, add subjects and pick up where you left off with your BBC account. Gravitational forces that make things fall down to the ground – unless another force stops them. An apple falling ...

EVERYWHERE YOU LOOK, you can see gravity’s fingerprint. It’s in the path the moon takes around Earth each night and the humbling thump when you wipe out on an icy patch of sidewalk. The force ...