At bedtime, Sol gets afraid of the dark. It's no problem – all they have to do is open the window and show Sol the stars. Sol loves stars. The next day, Cosmo and Sol join Dad and Lifter on a mission to Uranus. While Dad sets up a very complex machine, Cosmo and Sol explore the very squishy planet surface. It gets late and it is time for bed, but Dad still isn't finished. So Cosmo must put Sol to bed in the rocket ship. But it's so dark! Cosmo makes it her mission to show Sol the stars, which is not easy with the very thick atmosphere of Uranus.