The tale recounts the visit to Earth of a being from a planet circling the starSirius and his companion from the planet Saturn. This story and Voltaire's 'Plato's Dream' (another early precursor of Sci-fi) were probable influences upon H. G. Wells.
The technique of using an outsider to comment on aspects of western culture was popular at this period, and was used again by Voltaire in Zadig, and by Montesquieu in Lettres persanes (Persian Letters), amongst others.