How would Earth appear to alien astronomers? What would their observations tell them about Earth if they were searching the heavens for signs of habitability like we are? It's a fun thought experiment.
But the experiment is more than just fun: It's scientifically instructive. In many ways, it's easier to study our planet and how it appears and then extrapolate those results as far as they go.
It'll take a lot of science and innovative reasoning before we ever get to a point where we can say"Yes. This distant planet is habitable." The historical roots of this type of research go back to the [19]70s when spacecraft were visiting the planets in our Solar System. Pioneer 10 and 11 and Voyager 1 and 2 performed flybys of some of Earth's siblings.
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