What Can We Actually Find on an Exoplanet? Part 4: Looking For Us

Universe Today Universe Today —

Earth at night, its city lights tracing the footprint of human civilization.</p><p>Industry leaves atmospheric technosignatures an alien astronomer might detect.</p><p>Credit: NASA (public domain).https://www.universetoday.com/article_images/header_20260814_095912.jpg" width="1280" />

Some signs of an alien civilization are easier to spot than signs of life itself.

On technosignatures, from CFCs and industrial gases to the pandemic dip in pollution, and why Earth's most detectable moment might be right now.

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