Welcome to an episode of “Galactic Fauna: Mysteries of the Universe.” Today, we find ourselves on the desolate, rocky plains of Zerathon-3, a small planet orbiting the twin suns of the Thalos system. Here, the relentless dual suns beat down on the craggy terrain, where the heat can reach staggering highs, only to plummet to near freezing as the planet faces away into the deep chill of space.