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Circumference of Mercury (15,330 km) is 5 x Length of the Rio Grande (USA, Mexico) (3,057 km)
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Distance to Pluto (dwarf planet) (5.92 billion 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.