Two Earths?

Slate's blog Bad Astronomy reports that the Kepler spacecraft has detected at least five planets orbiting the cool orange star Kepler-62, with two Earth-sized and orbiting its habitable zone.

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Assuming they’re made up of the same materials as Earth (metal and rock) and therefore have about the same density, you’d weigh 60 percent more on Kepler-62e, and 40 percent more on Kepler-62f. I’ll note that all things considered, neither would be paradise: Kepler-62e gets about 20 percent more sunlight than we do on Earth, and Kepler-62f gets about half; a bit hot and cold for my taste. But again, we don’t know the conditions on these planets. Give Kepler-62e a thin atmosphere, and Kepler-62f a thick one, and they might look a lot like Earth.