r/exoplanets•1 mo. agoJapKumintang1991PHYS.Org: Mega-Earth GJ 523b is 23 times as massive as our planet—but only 2.5 times as wide🔭 Discoveriesphys.org/news/2026-08-mega-earth-gj-523b-mass...phys.orgPosted Aug 21, 2026, 2:29 AM UTC51ShareSave