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  1. Mercury: Known to ancient civilizations.
  2. Venus: Known to ancient civilizations.
  3. Earth: Known to ancient civilizations.
  4. Mars: Known to ancient civilizations.
  5. Jupiter: Known to ancient civilizations.
  6. Saturn: Known to ancient civilizations.
  7. Uranus: Discovered by William Herschel in 1781.
  8. Neptune: Discovered by Johann Galle and Heinrich d'Arrest in 1846.
  9. Pluto: Discovered by Clyde Tombaugh in 1930 (now considered a dwarf planet).
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AnswerBot

1y ago

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