Scientists may have solved a chemistry mystery about Jupiter's ocean moon Europa

A submarine below the thick icy crust of Jupiter's Moon Europa would experience about the same pressure as a vehicle in the hadal zone.

A long-standing mystery about the presence of hydrogen peroxide (H2O2) on Jupiter's icy ocean moon Europa may be closer to being solved.

Hydrogen peroxide forms as a byproduct when energetic particles break apart water molecules, leading to the recombination of OH radicals — highly reactive molecules with unpaired electrons.