A rare colourful northern lights show could be seen over Germany during the hours of darkness this weekend. However, this is not yet certain, according to Sami Solanki, director at the Max Planck Institute for Solar System Research. “If we have clear skies, especially to the north, I’ll drive up a hill and take a look,” he said. “But it is quite possible that I will come back disappointed.” Two coronal mass ejections, which are huge clouds of solar plasma, are currently on their way to Earth. “But we don’t know whether there will be a direct hit or just a grazing shot,” explained Solanki. One …