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Circumference of Pluto (7,470 km) is 2 x Length of the Mississippi River (3,730 km)
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Mass of a UK pound coin (2017) (8.75 g)
If this was a standard unit ...
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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Click here for Podcast: Andrew Elliott interviewed for New Books Network.