# The sidereal messenger of Galileo Galilei

By Galileo Galilei and Johannes Kepler.

"The Sidereal Messenger of Galileo Galilei" is an astronomical treatise published in 1610. It marks the first published scientific work based on telescopic observations. Galileo reveals stunning discoveries: mountains on the Moon's surface, hundreds of previously invisible stars in the Milky Way, and four celestial bodies orbiting Jupiter. Through detailed drawings and descriptions, he challenges long-held beliefs about the heavens. His observations of what he called the "Medicean Stars" would forever change humanity's understanding of the cosmos and our place within it. (Summary by Project Gutenberg, written by machine.)

- Language: English
- Translator: Edward Stafford Carlos
- Subjects: Astronomy -- Early works to 1800; Jupiter (Planet) -- Satellites

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From Project Gutenberg. Public domain in the United States.