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521 kilograms is about 0.00000000000000000000009 times as heavy as The Earth.
In other words, it's 0.0000000000000000000000872170 times the weight of The Earth, and the weight of The Earth is 11,465,999,999,999,999,475,712.0000000000000000000000000000 times that amount.
The mass of the planet Earth is 5,973,599,999,999,999,505,072,128.000000000000000000000000000000 kilograms. The element iron makes up about 32% of that mass, or 1,917,499,999,999,999,942,328,320.000000000000000000000000000000 kilograms.
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