
Europa Plume Reanalysis Dashes Confidence in Geyser Claim
A 2026 reanalysis of 14 years of Hubble data finds no localized water-vapour emission from Europa, lowering the original plume-detection confidence from 99.9% to under 90%. The study shows the prior signal could be explained by Europa’s diffuse hydrogen exosphere and small shifts in where the moon’s disk sits on the detector, rather than a true plume. It does not rule out small or intermittent vents, but it does not confirm a geyser or link it to the subsurface ocean. Future missions like NASA’s Europa Clipper and ESA’s JUICE will search more directly at closer range to settle the question.




