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Saturn was discoverd by Galileo Galilei in 1610. The telescope he used wanst't very good so he could not see details.
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The moons were discovered by Galileo Galilei in 1610. He discovered that Jupiter has four moons.
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In 1659 Christiaan Huygens discovered that the "arms" around saturn is really a system of rings.
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In 1659 Christiaan Huygens aslo discoverd SAturns one moon Titan.
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Jupiters great red spot was discovered by Giovanni Cassini in 1660. This is a giant storm that is still ranging.
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Predictians of Neptune were made by Urbain Le Verrier, but was condirmed in 1864 by Johann Gottfried Galle.
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Most of the discoveries of Uranus came from the voyager 2. This was a U.S space probe.
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On Uranus NASA noticed a bright sopt in one of the pictures. They think that the spot was a storm but they are still investigating.
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On July 19th, 2009 something hit Jpiter that was about twice the size of earth! Scientists still are not sure what hit Jupiter, but they are researching it.
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Neptune's Great Dark Spot was simuliar to Jupiter's Great Red Spt but smaller. It blows winds west at 300 mph.
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Pluto was origanally considered the ninth planet, but it is now known as a dwarf planet.