Could a threatened civilization escape an existential threat by hitchiking on a rogue planet? A new study says it might be possible.
Where do they all come from? Most are likely ejected from their solar systems due to gravitational events, but some may form via accretion as stars do.
Zooming out; the inner solar system , the outer solar system , the orbit of Sedna and the inner edge of the Oort cloud . Image credit: NASA There are lots of potential problems. Bringing a dwarf planet from the distant reaches of the Solar System into the inner Solar System could disrupt the orbits of other planets, leading to all sorts of hazards. But the dangers are mitigated if a civilization around a post-main sequence star has already migrated outward with the changing habitable zone. Romanovskaya discusses the energy needed and the timing required in more detail in her article.
Free-floating planets are also isolated and have fewer resources than planets in a solar system. There are no asteroids to mine, for example, and no free solar energy. There are no seasons and no night and day. There are no plants, animals, or even bacteria. They’re simply a means to an end.
Infrared emissions could be another technosignature emitted as waste heat by an ETC on a rogue planet. An excessive amount of infrared or unnatural changes in the amount of infrared could be detected as a technosignature. Infrared could be emitted unevenly across the planet’s surface, indicating underlying engineering or technology. An unusual mix of different wavelengths of electromagnetic energy could also be a technosignature.
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