To compare alien planets, Dr. Mendez at the Planetary Habitability Laboratory and his colleagues are creating an Earth Similarity Index that ranks worlds by their resemblance to our own planet, on a scale from zero to one, based on their mass, radius, density and surface temperature.

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Both were the subject of a massive manhunt in Watertown, Mass in the wee hours of Friday morning, where police sealed off a 20-block radius where the suspects were believed to be holed up and warned the public to stay indoors.

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