For as long as we've had eyes to see and minds to wonder we've marvelled at the stars. But it was only on the eve of the 21st Century that a handful of scientists dared to gaze into the gloom between, believing planets like our own Earth could be found there. Since the discovery of the first so-called exoplanet in 1994, the Planet Hunters have transformed the way we see the universe. We now know that every star in the sky has at least one planet. How many of them might host life?

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