Important: You must show all mathematical steps leading to your answer, especial

Question

Important: You must show all mathematical steps leading to your answer, especially for partial credits. Missing mathematical steps will not result in partial credit. A typical star like our sun with a mass of 2 times 10^30 kg is mainly made of 75% hydrogen and 23% helium and 2% heavier elements. Sun produces energy through nuclear fusion of hydrogen in which hydrogen is converted into helium and energy. Scientists conclude that about 13% of hydrogen is used in star life time for nuclear fusion and it uses this fuel at a rate of 600 million tons per second. Given above information calculate the life span of the star. 5 Points.

Explanation / Answer

The mass of a star describes its lifespan. The stars having least size will live the longest, while the stars having more size in the Universe will use their fuel up in a few million years and lead to end with supernova explosion..

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