In the hunt for life on other worlds, astronomers scour over planets that are light-years away. They need ways to identify life from afar — but what counts as good evidence?
Last year, NASA astronomers announced the discovery of a solar system with seven Earth-like planets. The TRAPPIST-1 system marked not only the highest number of Earth-like planets ever found around a star, but also the highest number in the “habitable zone,” a region where temperatures aren’t so extreme as to extinguish the planets’ chances of supporting life.
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