Tonight is a strange night. The moon does not have its usual glow, but a peculiar reddish color. Alexis and Alice observe it with curiosity "Could it be the night of the witches?" they wonder. However, their mom reassures them that there is no magic, but it is a natural phenomenon called an eclipse. She explains everything they want to know about the moon, the faithful companion of humans, and all creatures of the Earth, which lights their way at night. After all, the moon is the Earth's best friend, as it has been orbiting around it for many billions of years!