The light sources may look like explosions, but that was not my intention. I've been having fun using light sources in Terragen for a long time to get some mysterious lighting. In the Planet x series I even use (high intensity) light sources several times to replace suns. These sources were often very close to the ground to imitate a setting sun. By making a bad manipulation the camera ended up in high altitude and I saw that the effect was interesting. After several tests I made this rendering.