About the same diameter as Earth’s moon, the innermost of Jupiter’s four giant moons is covered in volcanoes, some emitting sulfurous plumes hundreds of miles into space. It’s been imaged by ...

On this date, Jan. 17, 2002, the Galileo probe made it’s 33 rd pass of Jupiter’s moon, Io. After Voyager 1’s pass in 1979, Io was dubbed the most volcanically active place in the solar system.

Jupiter is near Aldebaran, the star that makes up the eye of the bull in the constellation Taurus. | Credit: NASA/JPL-Caltech The moon will pass closely by Jupiter this evening (Jan. 10), meeting ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. The moon will pass closely by Jupiter this evening (Jan. 10), meeting up with the gas giant in ...