A star has a mass of 18 1030 kg and radiates energy at the
A star has a mass of 1.8 1030 kg and radiates energy at the rate of4.0 1026 W. What fraction of its original mass has the star lost inthis way since it began to burn hydrogen, about 4.2 109 y ago?
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a star has a mass of 18 1030 kg and radiates energy at the rate of40 1026 w what fraction of its original mass has the
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