What color is moonlight typically, and what other colors can moonlight look like from our perspective on Earth?

Io is only slightly larger than our moon, but it couldn’t be more different. What’s more, its environment is unlike anything found on Earth.

Researchers will be studying how Io interacts with Jupiter and how the moon is connected to the gas giant's auroras. If we're lucky, we'll get to see Io in a new way, getting up close and personal ...

A NASA spacecraft made its closest-ever approach to Jupiter's moon Io, coming within 930 miles of the "surface of the most volcanic world," and the space agency released new images of the flyby.

What we show is that, actually, volcanoes do have a large impact on the atmosphere.” Composite image showing Jupiter’s moon Io in radio (ALMA), and optical light (Voyager 1 and Galileo).

NASA said Juno's transit past Io over the weekend was the nearest flyby since a similar flight by the agency's Galileo spacecraft in 2001, which came within about 112 miles of the volcanic moon.

Jupiter’s third-largest moon Io is the most volcanically active world in our solar system. New radio images by the ALMA telescope array show the direct effect of this volcanic activity on the ...