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Callisto

A smooth, spherical shape appears against a black background, its dark gray surface covered in many overlapping lighter gray and white circular shapes of varying shades and sizes.
Posted inResearch Spotlights

Jupiter’s Moon Callisto Is Very Likely an Ocean World

Sarah Stanley, Science Writer by Sarah Stanley 18 February 202518 February 2025

A closer look at previously disregarded observations reveals stronger evidence that a deep ocean lies beneath Callisto’s icy surface.

Images of 3 craters.
Posted inEditors' Highlights

Unveiling the Origins of Dome Craters on Ganymede and Callisto

by Kelsi Singer 23 July 202422 July 2024

Large craters with broad central domes are a unique crater morphology on Jupiter’s largest icy moons: Ganymede and Callisto. A new study examines how remnant impact heat may lead to their formation.

Diagram showing the molecular hydrogen in Callisto’s atmosphere.
Posted inEditors' Highlights

Callisto’s H Corona: Offspring of the Surface or the Atmosphere?

by Beatriz Sánchez-Cano and Anni Määttänen 7 December 202222 July 2024

The mostly unknown Callisto’s H corona is created by a global tenuous H2 atmosphere and not by surface water as previously believed, providing the first evidence for H2 in Callisto’s atmosphere.

Composite satellite images of Jupiter’s Galilean moons: Io, Europa, Ganymede, and Callisto
Posted inNews

Jupiter’s Galilean Moons May Have Formed Slowly

Mara Johnson-Groh, Science Writer by Mara Johnson-Groh 30 September 201922 July 2024

A new model is the first to simultaneously explain many of the moons’ characteristics, including their mass, orbits, and icy composition

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