Astronomy
How Tidal Heating Drives Activity on Jupiter's Moon Io
Quick fact
Io's volcanoes erupt with such power that plumes rise 500 kilometers above the surface, and its surface is constantly repaved—no impact craters remain.
Why this is interesting
You know Earth has volcanoes, but did you know there's a moon with more than 400 active volcanoes? What could possibly power such relentless fury?