A concise history of Jupiter from the earliest pre-telescopic observations, to Galileo’s discovery of four large moons, to the robotic probes of the Space Age. This 12,000 word ebook Short Read describes how our knowledge of Jupiter and its four planet-sized moons Io, Europa, Ganymede, and Callisto has been transformed by the space probes that have visited this giant world and how the moons could possibly host life in subsurface oceans holding more water than all of Earth’s oceans put together.