Wobbling exoplanet hints at a hidden exomoon so massive it could redefine the word ‘moon’ altogether "In our solar system, the most massive moon is Ganymede, which is still extremely small compared to what we are inferring here." Astrobitica January 22, 2026 (Last updated: January 22, 2026) 1 minute read “In our solar system, the most massive moon is Ganymede, which is still extremely small compared to what we are inferring here.” About the Author Astrobitica Administrator Visit Website View All Posts Post navigation Previous: D-Orbit raises $128 million in first tranche of Series D fundingNext: iOptron 80mm White Light Solar Scope review