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310 long tons is about four-and-a-half times as heavy as The Space Shuttle
In other words, it's 4.4 times the weight of The Space Shuttle, and the weight of The Space Shuttle is 0.23 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 70 long tons. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 19 long tons.
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