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31.53 tons is about two-fifths as as The Space Shuttle.
In other words, the of The Space Shuttle is 2.5 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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