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(Music)

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The most comprehensive dataset from NASA's Kepler

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Mission will help researchers discover how many

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Earth-size planets are in our galaxy.

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Using four years of Kepler observations,

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the Planet Candidate Catalog contains

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the best characterized data yet.

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Observed in the Cygnus constellation, the data

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contains 219 new planet candidates.

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10 of these are less than twice the size

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of the Earth and orbit in their stars' habitable zone.

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The habitable zone is a range of distance

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from a star where water could pool on

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a rocky planet's surface.

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The data will be used by scientists to help

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determine the frequency and variety

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of planets in the galaxy.

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Kepler has identified more than 4,000 planet

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candidates and 2,300 confirmed planets

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orbiting other stars.

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Kepler's search for planets continues as part

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of an on-going study of different regions of space.

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Future studies could reveal a vast range of planet