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Only two of the planets (if we exclude Pluto) have official discoverers because the others have always been visible to the unaided eye. The two that were discovered are Uranus (in 1781) and Neptune (in 1846). Former planet Pluto was discovered in 1930.

As a preliminary, there are only 8. Pluto is technically no longer a planet.
It's not known when Mercury, Venus, mars Jupiter and Saturn where discovered, as they where know about throughout all written history in lots of cultures. So it's not recorded. Uranus 1781, Neptune 1846 Pluto, not considered a plant anymore 1930
The five (Mercury, Venus, Mars, Jupiter and Saturn) visible planets have been known since humans first looked up into the night sky. The Earth was also known.

  • Uranus was discovered on March 13, 1781 - although Uranus is actually visible to the naked eye, it would have been impossible to know it was a planet.
  • Neptune was discovered on September 23, 1846
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