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Who Discovered Jupiter?

It is unknown who discovered Jupiter. This is because Jupiter at times can be seen by the naked eye (no telescope needed). Jupiter is the 2nd brightest planet in the night sky (Venus is 1st).

The earliest record of the planet was found in ancient Babylonian texts from 800 to 700 BC in which Babylonian astronomers called it Marduk, after the Mesopotamian god and patron deity of the city of Babylon during the Hammurabi period (1800 BC). The planet was later referred to as Zeus by the ancient Greeks and Jupiter by the Romans.

On January 7, 1610, the astronomer Galileo Galilee trained his telescope on Jupiter and was the first person to observe the planet's four largest moons: Io, Europa, Ganymede and Callisto. These four moons are also called Galilean satellites after their discoverer. In 1664, the English physicist Robert Hooke was the first to notice a big red spot on Jupiter's surface. This spot later became known as the Great Red Spot and is still visible to this day, which makes it at least 350 years old.

The image on the right was taken by Marek Nikodem on March 18, 2012 outside Szubin, Poland. In the photo, Jupiter is at the left hand and Venus is at the right hand of the person.

Jupiter and Venus from Earth
Jupiter and Venus from Earth