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635,000,000 grams is about 1,500 times as heavy as a Grand Piano.
In other words, the weight of a Grand Piano is 0.00071 times that amount.
(for Steinway & Sons, Model D Concert Grand Piano)
A Grand Piano, of the kind used for concert performances in large music halls, weighs 450,000 grams. Well-made pianos such as this may last 75 to 100 years.
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