In January 1610, Galileo Galilei, using a newly improved telescope with 20x magnification, observed four celestial bodies orbiting Jupiter, initially appearing as stars. These bodies, later named Io, ...

Even in a backyard telescope, the four largest moons of Jupiter are big enough to be seen as little specks of light. And while humans have known about these “Galilean satellites” for centuries, there ...

Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky.

From "How to Train Your Dragon" to the Holst of his generation — this composer's grand tribute to four of the solar system's greatest wonders is ready to be heard. When you purchase through links on ...

67 moons orbit the great gas giant Jupiter; of these, the four largest are known as the Galilean moons, having been discovered by Galileo Galilei using his telescope in 1610. The four moons are Io, ...

Even in a backyard telescope, the four largest moons of Jupiter are big enough to be seen as little specks of light. And while humans have known about these “Galilean satellites” for centuries, there ...