NASA's Ebb and Flow, a pair of small spacecraft that have been orbiting the moon since the start of 2012, will crash into a predetermined spot near the moon's north pole Monday. "We are not expecting a big flash or a big explosion," said Maria Zuber, a Massachusetts Institute of Technology scientist heading the mission, which scientists plan to end deliberately. Ebb and Flow's surveys of the moon have created the most advanced gravity maps of the moon to date, as well as revealed that its crust is thinner than previously believed.

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