Behemoth sunspot AR1785 is undergoing a metamorphasis, changing shape by the hour as it turns toward Earth.
In less than 24 hours, AR1785 has stretched and lengthened by more than 40,000 km.
It is now more than 11 times as wide as Earth, which makes the active region an easy target for backyard solar telescopes.
One thing hasn't changed: the sprawling sunspot group has a 'beta-gamma-delta' magnetic field that harbors energy for strong solar flares.
Moreover, the shape-shifting of AR1785 could lead to explosive instabilities in the sunspot's magnetic canopy.
NOAA forecasters estimate a 55% chance of M-class solar flares and a 10% chance of X-flares during the next 24 hours.