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The greek Aristotle writted a theorie of the universe based on what Greeks considered geometrical perfect bodies; 5 bodies, then 5 planets: Mercury, Venus, Mars, Jupiter, and Saturn. Greeks do not have considered the Earth a planet.The do not have known about Uranus, Neptune, and Pluton.Today, have been discovered far objects with equal or suspected bigger size than Pluton (like Quaoar), and Pluton is not more considered a planet.

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12y ago
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14y ago

Uranus was discovered by William Herschel on March 13, 1781

Neptune was discovered on September 23, 1846 by Johann Gottfried Galle and Heinrich Louis d'Arrest. The various dwarf planets were discovered at various times, the first one discovered being 1 Ceres on January 1, 1801 by Giuseppe Piazzi.

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15y ago

Mercury, Venus, Earth (obviously) Jupiter and Saturn were all known by the ancients.

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13y ago

Uranus, Neptune and Pluto - now a dwarf planet.

(and of course all the exoplanets that have been discovered recently)

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14y ago

There are five planets that were known to the ancients; Mercury, Venus, Mars, Jupiter and Saturn.

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7y ago

Mercury, Venus, Mars, Jupiter, and Saturn were known in ancient times.

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12y ago

Uranus

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Q: Which 3 planets were not known to ancient people?
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