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999 kilograms is about 0.0000000000000000000000000005 times as heavy as The Sun
In other words, it's 0.000000000000000000000000000500 times the weight of The Sun, and the weight of The Sun is 2,000,000,000,000,000,026,575,110,144.000000000000000000000000000000 times that amount.
The sun has a mass of 2,000,000,000,000,000,179,380,838,125,797,376.000000000000000000000000000000000000 kilograms which represents 99.9% of the solar system's total mass. 98.7% of the sun's mass consists of hydrogen and helium — respectively the lightest and second-lightest elements in the universe.
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