In 400 years, telescopes advance from rooftops to mountains to orbit
Invention of the telescope. Claimed by Dutch lensmaker Hans Lippershey, although others (including Jacob Metius and Zacharias Janssen) are also sometimes credited.
GALILEO'S TELESCOPE | Istituto e Museo di Storia Della Scienza
Galileo improves the telescope and begins using it for astronomy, starting with lunar observations.
Source: Gary Brown/Photo Researchers Inc