Did you know? Mass of Callisto (moon of Jupiter) (107.6 sextillion kg) is 4 thousand x Mass of Nereid (moon of Neptune) (27 quintillion kg)
Mass of a mature Holstein cow (680 kg)
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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.