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Atom & Cosmos

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A LOT LIKE HOME  An Earth-sized planet capable of hosting liquid water and four other worlds orbit the cool red star Kepler-186, as seen in an artist’s illustration. The planet, found in data from the Kepler space telescope, is the smallest planet found in a star’s habitable zone. 

A bright arc, which is 1,200 kilometers long and 10 kilometers wide, at the edge of Saturn's rings suggests that the planet may be making a new moon. 

RETAINING WATER  Mars’ thin atmosphere, seen in a photograph taken by Viking 1, was denser in the past but not dense enough to keep surface temperatures above the freezing point of water for long times.

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