In order to answer to your question I went
to the Internet and I looked for the history of
the planets’ names. There are several places
where you can find this information, however I
recommend the following :
names for the planets
planets and their names
There it says that the planets’ names are
derived from Roman and Greek mythology, except
for the name Earth which is Germanic and
Old English in origin. The planets Mercury,
Venus, Mars, Jupiter, and Saturn where called
different names by different cultures; the
Romans named these planets according to their
movements and appearance. Mercury was
named for the winged Roman god of travel because
it appears to move so swiftly. Venus was
named after the Roman goddess of beauty.
Mars was named after the god of war.
Jupiter was named Zeus by the Greeks and
Jupiter by the Romans; Jupiter is the largest
planet on our solar system, and it is also the
most important deity in Greek and Roman cultures.
Uranus was named from the mythological
name of the Greek god of the sky, it was
discovered by Willian Herschel, who wanted to
name it “Georgium Sidus” after King George
III. Neptune was named for the Roman
god of the sea. Saturn was the Roman name
for the Greek Cronos, god of farming and the
father of Zeus/Jupiter.
And finally Pluto, which is not
considered a planet anymore, was named for the
Roman god of the underworld, possibly because
it's appropriate for the most distant world to
be named after the god of the underworld.
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