THE SPACE SUBMARINE AND THE MYSTERY OF THE POLAR NIGHT
James and Vladimir become friends, talk about their respective regions and observe the stars together, wondering why the night is so long at the poles of the Earth. Novice astronomers, they are trying to solve this mystery by reasoning and observation.
Thanks to the rigor of James and the inventive genius of Vladimir, their scientific adventure leads them to build an observatory and then an improvised spaceship. During a trip around the Earth, extended to Mars and Saturn, they get their answer and discover that the planets have similarities but also differences.