Venus: It was discovered before human history.
Earth: the planet where human beings live.
Mars: Red planet, discovered by astrologers in prehistoric times.
Jupiter: the largest planet in the solar system, discovered in ancient times.
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Saturn: A planet surrounded by a "halo", the second largest planet in the solar system. Galileo discovered Saturn's rings in 16 10.
Uranus: The third largest planet in the solar system, discovered by William Herschel in 178 1 year.
Neptune: the fourth largest planet in the solar system, discovered by Galileo in 1846.
Pluto: the smallest known planet in the solar system, discovered by Clyde Tombolo in February 1930.