Earlier, after Io's volcanic activity was discovered in 1979, scientists thought that the moon has a global magma ocean. But Juno, from its close flybys in December 2023 and February 2024 has helped ...
In binoculars, you will see a bright disc and possibly four moons — Io, Europa, Ganymede and Callisto –– arranged on either side of Jupiter. If you have trouble keeping binoculars steady ...