"Io represented a big mystery because its surface doesn't hold a record of its history the way that the surfaces of less active moons do." When you purchase through links on our site, we may earn an ...

Roughly 40 years ago, the Voyager 1 spacecraft sailed past one of Jupiter’s large moons, and it revealed something amazing: The rocky moon, called Io, is a volcanic champion, featuring the first ...

Io is the most volcanic body known to science, and researchers have puzzled over its history for years. A new report suggests it was born this way. This image revealing the north polar region of the ...

Jupiter’s moon Io is one the most exotic places in the entire solar system. It is also one of the worst places to try and establish a human colony (though none of the bodies in our solar system really ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. When we look at all the rocky worlds in our Solar System -- planets, ...

Why it's so special: NASA's Juno spacecraft has captured the closest views of Io since NASA's Galileo spacecraft imaged the volcanic world in 2001. Passing within just 930 miles (1,500 kilometers) of ...