See also: 1609 in science, other events of 1610, 1611 in science and the list of years in science.

Table of contents

1 Astronomy 2 Births 3 Deaths

Astronomy

• Galileo Galilei publishes his initial telescopic observations in a short treatise entitled Sidereus Nuncius (Sidereal Messenger). In the same year he discovers Jupiter's four largest satellites (moons): Io, Europa, Ganymede, and Callisto.