The European Space Agency's JUICE probe has successfully sent back its first detailed photographs of Ganymede and Callisto after recent close passes by these distant worlds.

Scientists are now studying the images to learn more about the moons' surfaces and possible hidden oceans beneath their icy crusts.

Early analysis shows varied terrain features that will help guide future observations during the mission's extended tour of the Jupiter system.

Data from these flybys marks an important milestone as the spacecraft prepares for deeper investigations in the coming years.

Researchers expect the new information to significantly expand our understanding of these enigmatic satellites.