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Galileo Galilei - Windows to the Universe

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Arches National Park Geology Tour provides an extensive, visually rich description of the geology of Arches, by Deborah Ragland, Ph.D. See our DVD collection.
Portrait of Galileo Galilei
Ottavio Leoni, Reunion des Musees Nationaux

Galileo Galilei

Galileo Galilei was an Italian astronomer and physicist who lived between 1564-1642. He was the first person to use a telescope to look at the heavens, and discovered craters in the moon.

Galileo found craters on the moon, and sunspots on the sun. This showed that the heavens weren't perfect, as Aristotle had said. This offended the Roman Catholic Church, and Galileo spent the later years of his life under house arrest.


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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part by the National Science Foundation and NASA, our Founding Partners (the American Geophysical Union and American Geosciences Institute) as well as through Institutional, Contributing, and Affiliate Partners, individual memberships and generous donors. Thank you for your support! NASA AGU AGI NSF