Readers offer their explanations for the absence of hard evidence for extraterrestrial civilisations, in response to an article by Adam Kirsch When thinking about why we have not encountered intelligent aliens yet, as Adam Kirsch does ( The long read, 11 August ), it seems to me that one factor g...

Source: [Guardian Science](https://www.theguardian.com/science/2026/aug/23/is-this-why-close-encounters-with-intelligent-aliens-have-so-far-eluded-us)

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