Six ways to find another Earth

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Transits are the jackpots of planet-hunting. A transit occurs when a planet crosses the face of its host star as seen from our solar system, fractionally diminishing the star’s light as it passes. Transits are, by their nature, rare occurrences, since for any particular line-of-sight the chance of a precise planet-star alignment is small, dictated by the ratio of the diameter of the host star to the diameter of the planet’s orbit.

Via boingboing.net

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