Transcript

NARRATOR 1:

But way out there in space, there’s huge clouds of dust and gas. And if one of those clouds of dust and gas is massive enough, its own gravity causes it to start to collapse. So it folds in on itself, and towards the centre of that cloud it gets denser and denser. It gets hotter and hotter.

And eventually, the particles that the gas and the dust are made of are brought so close together that they start to stick together. They start to fuse. That’s the energy source of a star. The star switches on and begins to shine.

NARRATOR 2:

Inside every newborn star, hydrogen atoms are fused together to make helium. This process is called fusion, and it creates the energy that powers every star.