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0.42550 tons is about one-two-hundredth as heavy as The Space Shuttle.
In other words, it's 0.0054 times the weight of The Space Shuttle, and the weight of The Space Shuttle is 190 times that amount.
(for Endeavour, a.k.a. OV-105, a.k.a. Orbiter Vehicle-105) (empty weight, excluding main engines)
When empty, the space shuttle Endeavour weighs 78 tons. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 22 tons.
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