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0.000000000000000300 megatonnes is about 0.000000000000002 times as heavy as The Sears Tower
In other words, it's 0.0000000000000014870 times the weight of The Sears Tower, and the weight of The Sears Tower is 672,500,000,000,000.0000000000000000000 times that amount.
(officially "Willis Tower" as of 2009) (Chicago, Illinois)
The Willis Tower weighs approximately 0.20180 megatonnes. The outer wall surface of the Tower is covered with black anodized aluminum panels which would total 110,000 sq. m (28 acres) if laid out together.
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