Diameter of Andromeda (closest large galaxy to the Milky Way)

Diameter of Andromeda (closest large galaxy to the Milky Way) (2.08 quintillion km)

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Is That a Big Number? - the book - is now available from all good booksellers.

"This is a fun and riveting book. Written in an accessible and engaging way, it is unputdownable." Frost Magazine

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