Scientists spent four years challenging an out-of-the-box theory that ammonia and water form slushy hailstones on the gaseous planet. Looks like it’s true.

Scientists have spotted a molecule linked to life in the atmosphere of K2-18b using the James Webb Telescope. Here is a look ...

They are here! The Moons of Jupiter join the cast! Meet Ganymede, Europa, Callisto and Io as they... do stuff. Welcome to ...

Enjoy dark skies for evening observing, then catch a meteor shower and a planetary conjunction in the morning sky this week.

Jupiter's volcanic moon Io doesn't appear to have a subsurface ocean of ... Coupled with similar but smaller gravitational tides from fellow moons Europa, Ganymede and Callisto, it means that a huge ...

Catch two transits of Io, spot sparkling star clusters, and view Mars at aphelion while the April Full Moon lights the sky ...

Other ocean worlds of intrigue include Saturn's largest moon, Titan; Jupiter's moons, Europa, Ganymede, and Callisto; Uranus' moons, Ariel, Umbriel, Oberon, and Titania; Neptune's moon ...

But it hasn’t always been this way. Jupiter’s four largest moons – Io, Europa, Ganymede and Callisto – were the first ever discovered orbiting another planet. They were spotted by Galileo ...

But it hasn’t always been this way. Jupiter’s four largest moons – Io, Europa, Ganymede and Callisto – were the first ever discovered orbiting another planet. They were spotted by Galileo Galilei more ...

In March and April 2025, internet users shared a striking image that they claimed showed "Steeple Mountain," a massive point of interest on Jupiter's moon Io. NASA Jet Propulsion Laboratory ...

In March and April 2025, internet users shared a striking image that they claimed showed "Steeple Mountain," a massive point of interest on Jupiter's moon Io. For example, one X user posted (archived) ...