![Galileo and the Telescope | Modeling the Cosmos | Articles and Essays | Finding Our Place in the Cosmos: From Galileo to Sagan and Beyond | Digital Collections | Library of Congress Galileo and the Telescope | Modeling the Cosmos | Articles and Essays | Finding Our Place in the Cosmos: From Galileo to Sagan and Beyond | Digital Collections | Library of Congress](http://www.loc.gov/static/collections/finding-our-place-in-the-cosmos-with-carl-sagan/images/galileo.jpg)
Galileo and the Telescope | Modeling the Cosmos | Articles and Essays | Finding Our Place in the Cosmos: From Galileo to Sagan and Beyond | Digital Collections | Library of Congress
Royal Institution of Great Britain - On this day in 1609 Galileo demonstrated his first telescope. This led to a series of ground-breaking findings, like how Venus showed a range of moon-like
![On This Day In History: Galilei Galileo Demonstrates His First Telescope - August 25, 1609 - Ancient Pages On This Day In History: Galilei Galileo Demonstrates His First Telescope - August 25, 1609 - Ancient Pages](https://www.ancientpages.com/wp-content/uploads/2017/08/galileosfirsttelescope7.jpg)
On This Day In History: Galilei Galileo Demonstrates His First Telescope - August 25, 1609 - Ancient Pages
![Galileo Telescope Building one for the IMSS based on measurements of the original at IMSS Institute and Museum of the History of Science Florence Italy see detailed photos of the original Galileo Telescope Building one for the IMSS based on measurements of the original at IMSS Institute and Museum of the History of Science Florence Italy see detailed photos of the original](http://www.scitechantiques.com/Galileo_telescope/ours_galileo_griffith-a.jpg)