And it has observed some dramatic features there, like a lake of lava and a large mountain. Even though Jupiter (and Io) are both far from the sun, and therefore receive little heat from sunlight ...

NASA’s Juno spacecraft identifies over 40 enormous lava lakes on Io, shedding light on the extreme volcanism sculpting Jupiter’s moon.

"Io is simply littered with volcanoes, and we caught a few of them in action," said Bolton. "We also got some great close-ups and other data on a 200-kilometer-long lava lake called Loki Patera.

NASA confirmed that a chunk of debris that crashed into a Florida home came from a battery pallet ejected from the ISS, and archaeologists found evidence that humans used a lava tube as a shelter ...