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In "modern times" as we know them, Uranus was the first planet discovered. All the other planets known to then were visible to the naked eye from earth, and, thus, were known to ancients. It is exceptionally dim and moves very slowly in its orbit. Uranus was discovered by William Hershel, who saw it in a telescope and announced his discovery on March 13, 1781.

The Neptune was discovered in 1846.

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When was the plant uranus discoved?

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Planet unknown in ancient times is?

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