Today in History
1608 – Fire destroys Jamestown, Virginia 1610 – Galileo discovers the first of four Jupiter satellites, Io, Europa, Ganymede, and Callisto. Although Jupiter has at least sixty-seven moons, these four, known as the Galilean moons, are extremely large. Ganymede, the largest, has a diameter greater than that of the planet Mercury 1714 – Typewriter...