Ata is the common name given to the 6-inch (15 cm) long skeletal remains of a human fetus found in 2003 in a deserted Chilean town in the Atacama Desert. DNA analysis done in 2018 on the premature human fetus identified unusual mutations associated with dwarfism and scoliosis, though these findings were later disputed. The remains were found by Oscar Muñoz, who later sold them; the current owner is Ramón Navia-Osorio, a Spanish businessman.
DNA analysis on the premature human fetus identified unusual mutations associated with dwarfism and scoliosis, although other research contested genetic abnormalities, finding that the skeleton showed normal fetal development. There is unfounded speculation by people such as UFO theorist Steven M. Greer speculated that Ata is an extraterrestrial, this speculation is inconsistent with DNA testing of the remains. Such speculation lead to Ata's inclusion in the 2013 U.F.O. movie Sirius and got the attention of Stanford University geneticist Garry Nolan whose analysis of the remains came after he contacted the production team.
Although initially thought to be older, the fetal remains have been dated to no more than 40 years ago, and have been found to contain high-quality DNA, suitable for scientific analysis. The remains have an irregularly shaped skull and a total of 10 ribs (as opposed to 12 for adult humans), and potential signs of oxycephaly. Considering that the frontal suture of the skull is very open and the hands and feet not fully ossified, anatomist and paleoanthropologist William Jungers has suggested that it was a human fetus that was born prematurely and died before or shortly after birth. An alternative hypothesis by Nolan, is that Ata had a combination of genetic disorders that led to the fetus being aborted before term and pediatric radiologist Ralph Lachman said that dwarfism alone could not account for all the features found in the fetus.
During the DNA analysis by Nolan, the B2 mtDNA haplotype group was found in the remains. Haplogroups identify human genetic populations that often are associated distinctly with particular geographic regions around the globe. Combined with the alleles found in the mitochondrial DNA contained in the remains, the findings suggested that Ata is indigenous to the western region of South America.
In March 2018 Nolan published additional results, stating that the fetus had a rare bone aging disorder, as well as other genetic mutations in genes associated with dwarfism, scoliosis, and abnormalities in the muscles and skeleton. The researchers identified 64 unusual mutations  in 7 genes linked to the skeletal system, and they noted that finding so many mutations that specifically affect skeletal development has never been reported before.
A subsequent study by an international research team, led by University of Otago bioarchaeologist Associate Professor Sian Halcrow, questioned the study published in March 2018 by Nolan, stating: "As experts in human anatomy and skeletal development, we find no evidence for any of the skeletal anomalies claimed by the authors. Their observations of ‘anomalies’ represent normal skeletal development in the foetus, cranial moulding from delivery, and potential post-mortem taphonomic effects" and that the team was "sceptical" concerning the genomic results. The authors also raised ethical concerns about the work by Nolan, saying "...studies such as these that do not address ethical considerations of the deceased and their descendant communities threaten to undo the decades of work anthropologists and others have put in to correct past colonialist tendencies."
The publisher of the earlier study, Genome Research responded by stating that the ethical standards did not cover work on "...specimens of uncertain biological origins, such as the Atacama skeleton," but also stated their intention to review their own policies on such studies. The authors of the Genome Research article published a response acknowledging the ethical concerns and calling for the repatriation of the remains. They attempt to distance themselves from possible ethical missteps by largely claiming ignorance about the handling of the remains, the circumstances of the discovery, and noting that they were presented with roughly a cubic millimeter of bone to analyze.
- Alyoshenka, a similar fetus allegedly found in a village in Russia
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The researchers involved never suggested this otherworldly origin