information mismanagement, and he cites three scenarios under which such a methodology or set of guidelines would be useful, those being "remote sensing" of a potential xenoarchaeological artifact, encountering an artifact during "human exploration," and "terrestrial interception" of an artifact. Greg Fewer has argued that archaeological techniques should be used to evaluate alleged UFO landing or crash sites, such as Roswell. History The origins of the field have been traced to theories about a hypothetical Martian civilization based on observations of what were perceived as canals on Mars. These theories, of which Percival Lowell was the most famous exponent, were apparently inspired by a mistranslation of a quote by Giovanni Schiaparelli. The 1997 Theoretical Archaeology Group conference featured a session on "archaeology and science fiction". The 2004 annual meeting of the American Anthropological Association featured a session Anthropology, Archaeology and Interstellar Communication. Planetary SETI Planetary SETI is concerned with the search for extraterrestrial structures on the surface of bodies in the Solar System. Claims for evidence of extraterrestrial artifacts can be divided into three groups, the Moon, Mars, and the other planets and their satellites. Examples of sites of interest include the "bridge" sighted in the Mare Crisium in 1953, and the "Blair Cuspids", "an unusual arrangement of seven spirelike objects of varying heights" at the western edge of the Mare Tranquillitatis, photographed by the Lunar Orbiter 2 on 20 November 1966. In 2006, Ian Crawford proposed that a search for alien artifacts be conducted on the Moon. Percival Lowell's mistaken identification of Martian canals was an early attempt to detect and study an alien culture from its supposed physical remains. More recently, there was interest in the supposed Face on Mars, an example of the psychological phenomenon of pareidolia. The Society for Planetary SETI Research is a loose organization of researchers interested in this field. The organization does not endorse any particular conclusions drawn by its members on particular sites. Probe SETI, or SETA A great deal of research and writing has been done, and some searches conducted for extraterrestrial probes in the Solar System. This followed the work of Ronald N. Bracewell. Robert Freitas, Christopher Rose and Gregory Wright have argued that interstellar probes can be a more energy-efficient means of communication than electromagnetic broadcasts. If so, a solar centric Search for Extraterrestrial Artifacts (SETA) would seem to be favored over the more traditional radio or optical searches.