If extraterrestrial life were discovered with properties unlike any of the three domains of life on Earth (Bacteria, Archaea, and Eukarya), it would likely require the creation of a new taxonomic level or classification system to distinguish it from Earth life. The current domains of life are based on the fundamental genetic and cellular characteristics observed in organisms on Earth, and they represent the major branches of the tree of life as we know it.

If extraterrestrial life were to exhibit unique properties that are fundamentally different from any known life forms on Earth, it would likely indicate a separate origin of life or an evolutionary trajectory distinct from that of Earth life. In such a case, scientists would need to develop new classification systems or taxonomic levels to accommodate and categorize this novel form of life.

Creating a new domain or higher-level classification would be a plausible approach, but the specific details and organization of the new system would depend on the characteristics and properties of the discovered extraterrestrial life. Scientists would need to conduct thorough investigations and analyses to determine the appropriate taxonomic framework for classifying and understanding this new form of life.
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