keywords: volcanoes jupiter plumes moon vents
text: Beware Dust from Jupiter's Moon Io Jupiter's moon Io is peppered with volcanoes, the hottest, most active volcanoes in our solar system. Sizzling vents spew plumes of gas and dust as much as 400 km high. They surge, spit, subside and surge again, non-stop. Passing spacecraft beware: Io is shooting at you.