Just. Wow. Massive sunspot group Active Region 3664 has grown in recent days to over ~200,000 km in size, large enough to span over half the distance between the Earth and the Moon. The spot is crackling with potential to unleash more X-class flares, and is thankfully rotating away from us. I can easily see the spot with eclipse glasses today from here in central Germany… no magnification required. SDO’s view is equally amazing:
