Are there civilizations somewhere else in the Universe? Somewhere else in the Milky Way? That's one of our overarching questions, and an answer in the affirmative would be profound.
The lead author is Chenoa Tremblay from the Commonwealth Scientific and Industrial Research Organisation . The paper is available on the pre-press site arxiv.org.
Different researchers describe technosignatures differently. But in broad terms, technosignatures are evidence of effects that can only result from the use of technology. Mega-engineering projects likeA sufficiently advanced civilization might be able to build them, or even to alter the orbits of stars. Those phenomena would be good evidence for another technological civilization. More mundane things like chlorofluorocarbons in an atmosphere would also be evidence, but maybe harder to detect.
The authors write that"[t]he existence of both powerful transmitters and sensitive receivers at low frequencies – both of which emerged early in the history of radio engineering – motivates low-frequency technosignature searches by providing an example class of engineered signals to search for, and instruments with which to do so".This search was aimed at the galactic center purely for economy of effort and results: it has the most stars.
With so many stars in the densely-packed GC, stellar flybys are more likely. Those are bad news for life, let alone civilization. They can disrupt protoplanetary disks and interfere in the planet formation process."Despite these factors, modelling by Gowanlock et al. finds a majority of planets that may support complex life are found toward the inner Galaxy .
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