Did you know? Diameter of Earth's Moon (3,480 km) is 400 x Height of K2 mountain (8.61 km) Tweet this comparison
Height of the main mast of the Cutty Sark sailing ship (47 m)
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If this was a standard unit ...
Yes, there's now a book based on these numbers. Oxford University Press: July 2018.
Click here to learn more about it.
Click here for Podcast: Andrew Elliott interviewed for New Books Network.