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The energy from the sun reaches just out...

The energy from the sun reaches just outside the earth's atmoshphere at a rate of `1400 W m^(-2)` . The distance between the sun and the earth is ` 1.5 xx 10^(11) m`. (a) Calculate the rate at which the sum is losing its mass. (b) How long will the sun last assuming a constant decay at this rate? The present mass of the sun is `2 xx 10^(30) kg`

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