SMETI: Migration Pathways of Advanced Civilizations via Free-Floating Planets and Their Technosignatures

To the point

Advanced extraterrestrial civilizations may migrate between star systems by riding or steering free-floating planets and similar ejected bodies, producing technosignatures that expand SETI into SMETI.

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Migrating extraterrestrial civilizations and interstellar colonization: implications for SETI and SETA | International Journal of Astrobiology | Cambridge Core
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Migrating extraterrestrial civilizations and interstellar colonization: implications for SETI and SETA - Volume 21 Issue 3