Students will describe several types of stars and explain how the mass of a star largely determines its evolution.
Stars go through stages as they consume their nuclear fuel.
The stages that a star will go through are largely determined by the mass of the star. Stars in all stages can be observed from Earth. On the basis of scientific evidence, the universe is estimated to be over ten billion years old. The current theory is that its entire contents expanded explosively from a hot, dense, chaotic mass. Stars condensed by gravity out of clouds of molecules of the lightest elements until nuclear fusion of the light elements into heavier ones began to occur.