article: Galileo Galilei
links: Callisto (moon) Europa (moon) Earth Trinity Moon University of Padua Venus Grand Duchy of Tuscany List of science books Inquisition Isaac Newton Ganymede (moon) Speed of light Geocentrism Heliocentrism Padua Florence Aristotle Michelson–Morley experiment Johannes Kepler Sun Julian calendar Milky Way Gregorian calendar Astronomy Gravity Galilean moons Christendom Giordano Bruno Nicolaus Copernicus University of Pisa Pisa Italy Catholic Church Leaning Tower of Pisa Jupiter (planet) Io (moon)