A distant planet may lurk far beyond Neptune

If Planet X exists, it may be anywhere from 250 to 1,000 times as far from the sun as Earth

An artist's illustration of Planet X

THE LOST WORLD  A hidden planet (foreground) might lurk in the uncharted realms of the solar system, leaving clues to its existence only in the orbits of dwarf planets or of chunks of ice in the outer edges of the Kuiper belt.

Nicolle Rager Fuller

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