Contact: Nancy Neal-Jones
NASA/Goddard Space Flight Center
Caption: Lobate scarps (a type of cliff) on the moon are found mostly in the highlands, and are relatively small and young. Scientists propose that they form as result of fracturing of the crust as the moon shrinks. Why is the moon shrinking? As the core slowly cools portions freeze from a liquid to a solid thus taking up less volume. Since the lobate scarps are small, hundreds of meters to several kilometers in length, and 10 to 50 meters in height, they must be young; otherwise everyday small meteor bombardment would have obliterated them.
Credit: NASA/Goddard/Arizona State University
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