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How large is the little prince's planet in The Little Prince?

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French postage stamp featuring an illustration of the Little Prince in a blue and red coat, with text reading Le Petit Prince and Republique Francaise, and a value of 3,00. — The Little Prince *Le Petit Prince* (*The Little Prince*) pictured on a French stamp, circa 1998.

In the fable The Little Prince by Antoine de Saint-Exupéry, the little prince’s home—believed to be the asteroid B-612—is described as being no bigger than a house.1