A major solar flare, possibly the second largest ever recorded, erupted today at 6:30 a.m. The intensity of the flare has sent a space storm careening towards the Earth. If the storm's magnetic field is in the right direction – opposite that of the earth – it could cause problems when it reaches us Wednesday. It could knock out power grids, upset satellites and disrupt GPS signals. More benignly, if the weather is clear, people who peer into the northern sky on Wednesday night could see a shimmer of lights known as an aurora,” says NJIT physicist Dale Gary.