Are close alien contacts still unseen

The article discusses reasons why we have yet to detect intelligent extraterrestrial civilizations, suggesting that the development of advanced technology depends on access to fossil fuels like coal, oil, and gas. Without these energy sources, alien societies may remain at early developmental stages, making their signals indistinguishable from natural planet activity. It also considers the possibility that advanced civilizations might choose to keep their distance, observing humanity before making contact.

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