Did you know?
Mass of Callisto (moon of Jupiter) (107.6 sextillion kg) is 5 x Mass of Triton (moon of Neptune) (21.4 sextillion kg)
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Length of the Rio Grande (USA, Mexico) (3,057 km)
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.