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Ganymede

Kobe University researcher Naoyuki Hirata was the first to discover that an asteroid impact on Jupiter's moon Ganymede occurred almost exactly on the meridian farthest from Jupiter. This finding suggested that Ganymede had experienced a reorientation of its rotational axis, enabling Hirata to calculate the type of impact that could have caused this shift.

Ancient Asteroid Impact Shifted Jupiter’s Largest Moon

A spectroscopic map of Ganymede derived from JWST measurements shows light absorption around the poles characteristic of the molecule hydrogen peroxide. The circle outlines the surfaces of the moon.

James Webb Space Telescope sees Jupiter moons in a new light

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