Astrolabius goes on an expedition!
The sixth book in the series 'Astrolabius Lives on the Moon' takes Astro and his friends to their home planet, Alpha Prime. The children fly in a highly modern shuttle, go on a three-day hike and, last but not least, a surprise awaits them. However, Director Jones has come up with even more and soon another project will start at the Lunar School. The pupils can win a prize. In addition, Marvin finally returns from the experiment in the asteroid group and takes the family on the next adventure. An unexpected incident occurs.