** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. ** The inception of what we now ...

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, ...

** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. ** British Galilean “optical” sights ...

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 ...

We already know a decent amount about how planets form, but moon formation is another process entirely, and one we're not as familiar with. Scientists think they understand how the most important moon ...

The moons of Jupiter. As mentioned last week, current count has them at 79, though only 53 have been officially named. The majority of these moons are fairly tiny, which is why it’s difficult to ...

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 ...