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Mercury - Has been known for thousands of years. However, it is the most difficult of the "naked eye" planets to see.

Venus - Has been visible to everyone who has looked into the skies.

Earth - The first to scientifically identify Earth as a planet was probably Copernicus.

Mars - Has been visible to everyone who has looked into the skies.

Jupiter - Has been visible to everyone who has looked into the skies.

Saturn - Has been visible to everyone who has looked into the skies.

Uranus - William Herschel was the first to see and identify Uranus as a planet.

Neptune - Johann Galle and Heinrich d'Arrest, based on calculations by Urbain Le Verrier (and John Couch Adams).

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Riley Wolf

Lvl 13
3y ago

What else can I help you with?