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by Answerbag Staff on March 31st, 2010

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What kind of telescope did Galileo turn skyward in 1610?

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  • by Contributing Writer on March 31st, 2010

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    Galileo was an Italian mathematician and astronomer who used a refracting telescope to study the sky in 1610. Although he did not invent the telescope, he improved the design of an early telescope developed in the Netherlands.

    Refracting Telescope

    Galileo's first telescope was rudimentary, consisting of a tube with two lenses. Galileo's next telescope was more powerful and capable of magnifying images nine times.

    How Galileo's Telescope Worked

    Galileo's telescope used concave and objective lenses to refract light and bring objects into focus. He struggled to find properly fitting lenses for his telescope which limited his work.

    Jupiter

    In 1610, Galileo, using a refracted telescope, discovered four satellites surrounding Jupiter. In honor of the Grand Duke of Tuscany, he named the satellites the Medicean stars.

    Moon

    Through his observations, Galileo found that the moon's surface was rough and uneven, thus contradicting the belief that the moon's surface was smooth. Italian mathematicians certified Galileo's discoveries concerning Jupiter and the moon.

    Galileo's Later Life

    The Catholic Church disapproved of Galileo's work and prohibited the publication of some research concerning the Copernican theory. However, the Church later allowed dissemination of some of Galileo's work but later contended that he heavily advocated the Copernican theory. As a result, the Pope imprisoned Galileo and he remained under house arrest until his death in 1642.

    Source:

    PBS; Galileo's Battle for the Heavens

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