Did you know? Mass of R2-D2 droid in the Star Wars movies (32 kg) is 4 thousand x Mass of a British gold sovereign coin (7.99 g)
Mass of dwarf planet Eris (16.6 sextillion kg)
/fact/mass-of-dwarf-planet-eris
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"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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