Griaule and Dieterlen's fullest published account of Dogon cosmology also came to include specific claims about the star system Sirius, reportedly including knowledge of an invisible companion star following an elliptical fifty-year orbit, a description that appeared to anticipate the scientifically confirmed existence of Sirius B, a white dwarf first detected by telescope in 1862 and confirmed by spectroscopy only in 1915. Publicized from the 1970s onward, this account fueled popular speculation about ancient astronomical transmission or extraterrestrial contact, speculation the anthropological literature treats separately from, and skeptically of, the underlying ethnographic question.
That underlying question was tested directly by the anthropologist Walter van Beek, whose own fieldwork among the Dogon was published as Dogon Restudied in 1991. Van Beek reported he could not locate the specific Sirius material among informants outside the small circle who had worked closely and repeatedly with Griaule over many years, and argued that Griaule's method, which relied on a few privileged informants and treated inconsistencies as evidence of deeper esoteric layers rather than ordinary contradictions, may have generated content shaped by that extended exchange rather than reflecting an independently attested tradition. The dispute between Griaule's account and van Beek's restudy remains unresolved in the literature, and this entry records both positions without adjudicating between them. The wider Nommo tradition of water spirits and culture-bringing twins is independently attested across both scholars' work and is not itself in question.