Distant star's 'superflare' may have caused powerful solar storm.

Scientists have observed one of the most powerful and gargantuan stellar flares ever seen from a star system called V1355 Orionis, which is about 400 light-years from Earth. The superflare is 10 times more massive than anything ever witnessed erupting from the sun and may have launched one of the largest coronal mass ejections (CMEs) ever observed. Superflares originate from stars that are highly magnetically active and may be accompanied by enormous eruptions of charged particles that could devastate life on any planets in their firing line.