Of the new candidates, 68 are one-and-a-quarter times the size of the Earth or smaller ? smaller, that is, than any previously discovered planets outside the solar system. Fifty-four of the possible exoplanets are in the so-called habitable zones, where temperatures should be moderate enough for liquid water, of stars dimmer and cooler than the Sun; four of these are less than twice the size of Earth, and one is even smaller.
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http://www.nytimes.com/2011/02/03/science/03planet.html