ocr: LIFESPAN OF THE SUN The Sun was formed some 5 billion years ago from interstellar material, which is not evenly distributed, but is rather in the form of clouds. When gravitation slowly condensed the particles of this cloud, a so-called primitive sun was born. An orbiting disc of the same particles formed around its equator. Both the primitive sun and the disc continued to compress. Due to the compression, the size of the gas cloud decreased to a fraction of its original size, and as the pressure increased, it heated to an infrared radiation releasing protostar. The gravity caused the protosun ...
