Did you know?
Mass of Umbriel (moon of Uranus) (1.17 sextillion kg) is 400 x Mass of Puck (moon of Uranus) (2.9 quintillion kg)
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Land Area of Tunisia (163,600 km^2)
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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