Xenoarchaeology is the study of alien culture and history through the excavation of ancient sites and the analysis of physical materials. A Human xenoarchaeologist, for example, may specialize in Hadesian artifacts, whereas a Xi’an xenoarchaeologist may be an expert in excavating ancient Human pottery. Xenoarchaeology is mainly concerned with recovering knowledge of prehistory, especially of extinct alien civilizations. It draws upon multiple disciplines and requires years of study, mentorship, and practice.