... a giant cloud of gas and dust, called a nebula. The mass of the star is determined by how much matter is available in its nebula. With more mass, comes a shorter life cycle. Through time, hydrogen gas is pulled together and eventually begins to spin. As the spinning gradually increases, the heat of the hydrogen rises in temperature. When 15,000,000 degrees ... exceeded, a nuclear fusion will occur and the substance will begin to glow brightly (Spritzer 128). This is now called a main sequence star. This is the central phase of the life cycle. An average star will expand as it runs out o...

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