On this day in history, January 7, 1610, Galileo discovers the moons of Jupiter Posted by | Jan 7, 2024 | Red Pill NOWlej | 0 | Jupiter is the largest planet in our solar system with 80 moons. Galileo was the first to discover the moons of Jupiter on this day in history, Jan. 7, 1610. Read More in FOX News. Read More in Red Pill NOWlej.