Eight distant worlds hold secrets that still puzzle scientists and spark endless curiosity. Each moon offers a strange allure ...

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 ...

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 ...

ESA's Mars Express orbiter captured footage of the Mars' moon Deimos pass in front of Ganymede, Europa, Jupiter, Io and ...

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 ...

Looking for a sky event this week? Check out our full Sky This Week column. November 19: Venus rises in Libra Tonight, all ...

Jared is a writer, editor, and Communications Studies graduate who loves popular nerd culture (almost anything to do with Marvel, DC, Star Wars, or The Lord of the Rings) and the interactive ...

Tonight the crescent Moon puts down stakes near the planet Mars as we reflect on the days when dinosaurs cracked jokes about mammals. Then it's time to set the alarm to catch tomorrow morning's ...