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Galileo: 400 Years of the Telescope

In 1609, Galileo constructed the first powerful telescope and started observing the heavens, which led to many monumental discoveries. He published his initial findings on the moon and the stars in 1610 in a brief treatise titled "Sidereus Nuncius" ("Starry Messenger"). An original printing of this publication is held by the Rare Book and Special Collections Division of the Library of Congress.

Michelle Thaller is assistant director for science communication and higher education at NASA's Goddard Space Flight Center.

Galileo: 400 Years of the Telescope


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