I couldn't wait to tell the rest of the story, covering the last four songs of Planet and Sky, a cosmic love story. Things take a darker turn as the relatively small planet lacks sufficient gravity to hold onto its atmosphere. First we hear from the Travelers again as they gradually become frozen below the surface, then Sky sings her mournful aria to Planet informing him of their demise. We then get an empty, barren world, until the scientists come up with a plan. I share some background on my favorite song and feature it at the end of the episode.