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No one specificly discovered Saturn. Galileo was the first to look through a telescope to find part of Saturn because different people found diffferent parts of Saturn.
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You can see Jupiter without using a telescope. Galileo found Jupiter in 1610. It also has a giant red spot on it which is a giant storm.
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The discoverer of Uranus was William Herschel.
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No one really discovered Venus, but observations of Venus were in 1800's B.C.
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Alexis Bouvard is the one who discovered Neptune.
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Galileo was the first human to discover Mars in the 1900's.
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It is unknow when Mercury was found or even who found Mercury because it can be seen by the naked eye.
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It is unable to be identified as to whom discovered the Earth, but what we do know is that it was found 4.5 billion years ago.