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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.

GAMMA GENERATOR  Gamma-ray emissions from the center of the Milky Way appear as colors other than purple in these images.. The panel at right shows that when emissions from known gamma-ray sources are removed, a strong signal about 10,000 light-years across remains. A team of physicists argues that dark matter particles are responsible for those gamma rays.

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