Project Gutenberg was the first provider of free electronic books, or eBooks. Michael Hart, founder of Project Gutenberg, invented eBooks in 1971 and his memory continues to inspire the creation of eBooks and related technologies today.The Sidereal Messenger of Galileo Galilei by Galileo Galilei and Johannes KeplerAuthor: Kepler, Johannes, 1571-1630,Language: English, Class: QB: Science: Astronomy, Release Date: Jun 19, 2014