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Mass of Rhea (moon of Saturn) (2.31 sextillion kg) is 1 thousand x Mass of Sycorax (moon of Uranus) (2.3 quintillion kg)
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Cost of a SpaceX Falcon 9 rocket launch ($62million)
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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