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 ...

That disk pulled more dust and gases into the center due to a force called gravity. Eventually, the pressure at the core of the disk was so strong that the materials fused together, releasing ...