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Distance to the Heliopause (limit of the Solar System) (17.95 billion km) is 4 x Distance from the Sun to Neptune (4.5 billion km)
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Mass of a large watermelon (10 kg)
If this was a standard unit ...
"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine
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Click here for Podcast: Andrew Elliott interviewed for New Books Network.