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Diameter of Mercury (4,880 km) is 2.5 x Length of the Tigris River (1,950 km)
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Distance to Andromeda (closest galaxy to the Milky Way) (24.22 quintillion km)
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.