Speaking of light, the high activity of the aurora borealis is set to continue in 2015, with solar winds interacting with charged particles in the earth’s magnetic field frequently illuminating the polar sky. Luck, cloudless skies and the new NorwayLights app are what you need to glimpse this natural phenomenon. The flickers of purple, swirls of gold and flashes of green are like the strobe lights of Norse gods at a heavenly rave.