Boulders on otherwise smooth floor are seen
Boulders on an otherwise smooth floor are seen on the Mare Tranquillitatis pit crater on the surface of the Moon in this NASA image taken by the NASA's Lunar Reconnaissance Orbiter and released September 14, 2010.
Massive boulders peeled away from a cliff and buried dozens of homes in an Egyptian shanty town Saturday, killing at least 18 people, authorities said.