The Pale Blue Dot: Earth photographed by Voyager 1 from six billion kilometers away in 1990. Everything we are is in that single point of light. Credit: NASA/JPL-Caltech (public domain).

If an alien civilization could see Earth only as a single pale blue dot, what could they learn? We start with transit spectroscopy, the biosignature cocktail of oxygen, methane, ozone, and water, and why even the James Webb will struggle to find life.

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