Galileo Galilei, Italian astronomer discovered Jupiter’s satellites by telescope then published in the book Siderius nuncius (The Starry Messenger), in 1610. The Medicean stars originally named after Cosimo II de’ Medici were later changed to Io, Europa, Ganymede, and Callisto by Simon Marius, a German astronomer discovering them later in 1610.
- moons of Jupiter – Wikipedia
The Galilean moons are the four largest moons of Jupiter—Io, Europa, Ganymede, and Callisto. They were first seen by Galileo Galilei in December 1609 or January 1610, and recognized by him as satellites of Jupiter in March 1610. They were the first objects found to orbit another planet.
- Galileo’s Observations of the Moon, Jupiter, Venus and the Sun …
Feb 24, 2009 – He discovered that the sun has sunspots, which appear to be dark in color. Galileo’s discoveries about the Moon, Jupiter’s moons, Venus, and …
- The Discovery of the Galilean Satellites – Solar Views
Galileo first observed the moons of Jupiter on January 7, 1610 through a homemade telescope. He originally … Galileo’s Observations of Jupiter’s Moons.
- Galileo Discovers Jupiter’s Moons | National Geographic Society
Dec 17, 2013 – On January 7, 1610, Italian astronomer Galileo Galilei discovered, using a homemade telescope, four moons orbiting the planet Jupiter.
- Jupiter’s Moons: Facts About the Largest Jovian Moons | Space
Oct 1, 2018 – Most of the moons of Jupiter are small, with about 60 of the satellites being … Galileo’s discovery was pivotal point in the history of astronomy as …