Christiaan Huygens ( listen   ( help · info ) ) (April 14, 1629?July 8, 1695) was a Dutch physicist , mathematician and astronomer , born in The Hague . He was known for his idea that light was in the form of waves . He discovered Saturn 's largest moon Titan in 1655. He also did detailed studies on Saturn's rings , and in 1656, he discovered that they are made up of rocks . He also studies optics and pendulum clock .

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