But deep in the core is a remarkable chemical factory. The stars generate stuff. They make all the matter that you and I are made of, from hydrogen and helium, but they make this heavy stuff that we are made of. They're the factories that make material. So to understand the universe, we need to study the stars.
Every star has a core.
Almost all stars are generating nuclear energy, transmuting elements from one to another, building up the heavy elements, the whole building blocks of the universe. We believe the physics in most stars is the same as the physics on earth. This physics we need to understand more carefully, so that under extreme conditions, we can work out what that physics implies. On the very large scale, what it implies about the structure of the universe and how the whole universe evolves. Douglas Gough Our ancestors saw a perfect disc of light.