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635,000,000 grams is about nine times as heavy as The Space Shuttle.
In other words, it's 8.90 times the weight of The Space Shuttle, and the weight of The Space Shuttle is 0.110 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 71,000,000 grams. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 20,000,000 grams.
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