Venus, Mars, Jupiter, and Saturn, at a minimum, were known by the Babylonians to be different from stars by 1000 B.C. and probably earlier. Since those planets were visible to everyone, they were “discovered” as objects without any particular understanding as planets when the first human looked into the night sky.
The first planet discovered using the aid of a telescope was Uranus, by Sir William Herschel in 1781. The first extrasolar planet was discovered 1992.
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