A bit larger than our Moon, Io is the innermost of Jupiter’s four large moons. As it circles Jupiter, Io is gravitationally perturbed by its three sister moons, first being pushed slightly closer to ...

Other moons of Jupiter, like Europa and Ganymede ... over 20 years ago. In size, Io is roughly comparable to the Earth’s moon, also known as “The Moon”. Io is wracked by volcanic activity ...

Like Earth's moon, Io is tidally locked to Jupiter, with one side more readily available for study than the Jupiter-facing side. But Jupiter's effect on Io is much stronger than Earth's effect on ...

Learn how you can see bright Jupiter from Earth, helped by its massive size and banded, reflective cloud tops, in December's ...

It’s been imaged by spacecraft—notably by NASA’s Juno in recent months—but this is the best-ever image using an Earth-based instrument. Jupiter moon Io, imaged by SHARK-VIS on Jan.

Transits, occultations, eclipses, and shadow transits of the jovian moons are perfect events for telescopic viewing.

On Oct. 14, 2024, NASA launched a robotic spacecraft named Europa Clipper to Jupiter’s moons. Clipper will reach the ...

Magnetic vortices twisting down from Jupiter's ionosphere into its deep atmosphere cause giant, ultraviolet-absorbing polar ...

While Jupiter’s Great Red Spot has been a constant feature of the planet for centuries, a team of astronomers have discovered ...

Advising readers to scan the night sky this time of year always feels a little awkward, because the Pacific Northwest’s ...