When was jupiter discovered as a planet

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He was also the first astronomer to discover the four largest moons that orbit the planet. These moons are:. Galileo began seriously observing the planet in Galileo soon realized that the fixed stars were actually orbiting Jupiter. Galileo continued to observe the moons for over a year. He attempted to estimate their periods. At the time, the majority of Europe still endorsed a theory that all the planets orbited around the Earth.

According to this theory the geocentric model of the solar system , the Earth was at the center of the Universe. However, Galileo identified smaller fixed points that were orbiting Jupiter. This went against the geocentric model that stated all heavenly bodies should orbit the Earth.

Jupiter is the fifth planet from the Sun. Why is it so hard? It is one of the five planets that can be seen in the night sky. Only Venus and the Moon are brighter. Frankly, it is nearly impossible to miss. NASA lists the planet as having been discovered by the Ancients. The planet is called Marduk in ancient Babylonian texts, Zeus in early Greek manuscripts, and Jupiter in Roman antiquity.

What is known are some of the firsts in the exploration of Jupiter.