What Earth 2.0 really means to us

Is there anybody out there?” sang the Pink Floyd in 1980, in their masterpiece double LP “The Wall”. Back then, there was little hope that humankind might ever discover Earth-like planets in the Universe. Thirty-five years later, the tune has changed: Today, chances are much greater that something or somebody will eventually get in touch with us from the depths of space.

Comparison between the Earth and Earth 2.0 (artistic concept). Image credit: NASA/Ames/JPL-Caltech/T. Pyle

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