If Planet Nine exists, why has no one seen it?

If Planet Nine exists, why has no one seen it?

The 19th-Century travel writer and businessman – fabulously wealthy, perennially moustachioed, and often found in crisp three-piece suits – had read a book on Mars, and on this basis, decided to become an astronomer. Over the coming decades, he made a number of wild claims.

planet solar system

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