Did you know?
Mass of Oberon (moon of Uranus) (3.01 sextillion kg) is 2 x Mass of Charon (moon of Pluto) (1.52 sextillion kg)
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Land Area of Estonia (2,840 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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