Over the last few hundred million years, the moon's belt line has slimmed by approximately 150 feet.
In 2010, Watters spearheaded a team that scrutinized images from Lunar Reconnaissance Orbiter instigated in 2009 and discerned innumerable serpentine cliffs administered broadly over the surface.
Seismometers - instruments that measure the shaking produced by quakes - were placed on the moon's surface by the Apollo 11, 12, 14, 15, and 16 missions. The agency has long had ambitions to return to the lunar surface, even beginning plans to build a space station in orbit of the moon to make it easier.
These faults are also "likely producing moonquakes" that can be as strong as a magnitude-5 quake on the Richter scale, NASA cited Thomas Watters, a senior scientist at the Smithsonian's National Air and Space Museum, as saying. It's not just the finances that are only now falling in place, NASA also has an untested new rocket - the Space Launch System - and a crew capsule in construction to carry astronauts back to the Moon, to Mars and beyond.
Approximately 4.5 billion years old, the Moon is considered "tectonically active", the researchers wrote in the study, published in the scientific journal, Nature Geoscience. A bright area on lunar surface indicates that the area is freshly exposed space.
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Also, the scientists discovered that the moon had been shrinking as it interior cooled down and maybe getting even smaller as its crust becomes brittle more like what happens to the grape as it dries out and becomes a raisin. Now, researchers have found evidence that active faults on the crust of the moon caused the shakes. Additionally, while other events, such as meteoroid impacts, can produce quakes, they produce a different seismic signature than quakes made by fault slip events.
Six out of the eight tectonically active moonquakes occurred when the Moon was at or close to its apogee, the point where it's most distant from Earth and where the diurnal and recession stresses create the most compression near the tidal axis. Although, without better data, she notes that the team has done as good of job as possible at pinpointing the location of the quakes detected on Apollo missions.
Centered in the budget proposal are NASA's aims for space exploration over the next decade.
-It is truly remarkable to see how the data from almost 50 years ago and the LRO mission were combined to advance our understanding of the Moon while suggesting where future missions to study the inner processes of the Moon will take place.