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RING REMNANTS  The mighty ridge adorning Saturn’s moon Iapetus has steep slopes, which researchers suggest is a sign that debris falling from space stacked up and formed mountains on the moon’s surface.

The Lunar Atmosphere and Dust Environment Explorer, seen orbiting the moon in this artist’s illustration, slammed into the lunar surface April 18, marking the end of its 224-day mission.

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. 

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