  With Cyrano, Voltaire, and Verne, France provided important milestones in the
history of early science fiction. However, even if the genre was not very
common a few centuries ago, there were numerous additional contributions by
French-speaking writers. In this paper, we review two cases of interplanetary
novels written in the second half of the eighteenth century and sharing a rare
particularity: their authors were female. Voyages de Milord Ceton was imagined
by Marie-Anne de Roumier-Robert whereas Cornelie Wouters de Wasse conceived Le
Char Volant. While their personal lives were very different, and their writing
style too, both authors share in these novels a common philosophy in which
equality -- between ranks but also between genders -- takes an important place.
Their works thus clearly fit into the context of the Enlightenment.
