On This Day In History: Galilei Galileo Demonstrates His First Telescope - August 25, 1609 - MessageToEagle.com
Newtonian telescope - Wikipedia
Mauspad The Scientific Physiker Astronomer Galileo Galilei Teleskop in Blau Mauspad für Notebooks, Desktop Computer Mauspad 24,8 x 29,5 cm: Amazon.de: Bürobedarf & Schreibwaren
Galileo and his Telescope, the First Eyes to Look Deeply into Space | OpenMind