Correction for the weight of The Sears Tower
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How heavy is 0.000000420 megatonnes?
It's about one-five-hundred-thousandth as heavy as The Sears Tower
The weight of The Sears Tower is about 0.20180 megatonnes.
(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.