Long posited as a potential human outpost in science fiction, Jupiter’s icy moon of Callisto largely remains a mystery to real life planetary scientists. As one of the least studied of Jupiter and ...

New evidence from an old NASA mission supports the theory that Jupiter's moon Callisto is in fact an ocean world. Credit: NASA / JPL / DLR A moon of Jupiter about the size of Mercury likely has a ...

Callisto, Jupiter's second-largest moon, may have a rocky surface with an ocean beneath the surface. If there was a contest for the most interesting moon in our solar system, Callisto would be a ...

James is a published author with multiple pop-history and science books to his name. He specializes in history, space, strange science, and anything out of the ordinary.View full profile James is a ...

Still seven years from Jupiter, the JUICE mission is pretending it's already there. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Though it's ...

The Moon and Mars gather in the west at dusk this evening. Stellarium Tonight the returning young crescent Moon puts down stakes near the planet Mars in Sagittarius. Look for the pair low in the ...

Tonight, the Moon will pass close to bright Jupiter, offering stargazers a striking and easily visible sight. This naked-eye event will make two of the night sky’s brightest objects appear side by ...

Looking for a sky event this week? Check out our full Sky This Week column. October 12: The Saturn Nebula shines Last Quarter ...