Why is io Jupiters brightest moon?

Answer 1

because it has all these mega cool volcanic eruptions, like, and it creates an epicly wide surface area so it looks really cool from jupiter. not that ive actually been to jupiter. you know id actually like to go , wouldnt it be awesome?

Answer 2

Io is Jupiter's brightest moon because it is covered in a high amount of sulfur and sulfur compounds, which reflect sunlight very effectively. It also has active volcanoes that constantly spew out lava and material, contributing to its brightness.