Sun unleashes strongest solar flare of 2025, sparking radio blackouts across Africa and Europe The X5.1-class eruption from sunspot AR4274 is this year's most powerful solar flare and Earth is in the firing line. Astrobitica November 11, 2025 (Last updated: November 11, 2025) 1 minute read The X5.1-class eruption from sunspot AR4274 is this year’s most powerful solar flare and Earth is in the firing line. About the Author Astrobitica Administrator Visit Website View All Posts Post navigation Previous: China continues assessment of Shenzhou-20 crew return after suspected debris strikeNext: Rocket Lab delays first Neutron launch to 2026