The Moon is steadily shrinking

Moon earthquakes: Tectonic activity is making the Moon shrink - Daily Star

The scarps form when one section of the Moon's crust (left-pointing arrows) is pushed up over an adjacent section (right-pointing arrows) as the Moon's interior cools and shrinks. But 28 of those quakes were relatively shallow and powerful - one had a magnitude of 5.5, according to a NASA factsheet.

There are now thousands of cliffs scattered across the moon's surface, averaging a few miles long and tens of yards high.

A handful of similar examples were noted in photographs taken from Apollo craft as they orbited near the moon's equator, but it was not until 2010 that the Lunar Reconniassance Orbiter Camera, capable of recording details less than a metre across, revealed that such scarps can be found scattered across the whole globe. The algorithm gave a better estimate of moonquake locations.

'Our #Moon2024 mission is being named after Artemis, who was a sister to Apollo and goddess of the Moon, ' Bridenstine tweeted ahead of the summit. Bhavya Lal of the Science and Technology Policy Institute led a recently published study, mandated by the 2017 NASA authorization act, that concluded that a 2033 mission to Mars was not feasible, with the earliest possible date for such a flight in 2037 or 2039.

Astronauts placed five different seismometers during the subsequent Apollo missions from Apollo 11 to Apollo 16. Watters hopes the LRO team will be able to re-analyse fault scarps imaged by the orbiter since 2009 to find evidence of movement-that would be a smoking gun signature, he said. Eight quakes occurred close to faults. Analytical modelling of tidal forces that contribute to the current lunar stress state indicates that seven near-apogee events within 60km of a fault scarp occur at or near the time of peak compressional stresses, when fault slip events are most likely. They found it is less than 4 percent.

NASA flew six manned missions to the surface of the moon, beginning with Neil Armstrong and Buzz Aldrin in July 1969, up to Gene Cernan and Jack Schmitt in December 1972. Boulder tracks near faults in Schrödinger basin have been attributed to recent boulder falls induced by seismic shaking.

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If the very first lunar mission was a small step for man, the next shall be a giant leap for women. The fault scarps themselves are also a clue.

"You don't often get to see active tectonics anywhere but Earth, so it's very exciting to think these faults may still be producing moonquakes", said Nicholas Schmerr in a statement, study author and assistant professor of geology at the University of Maryland.

NASA is getting more money for its upcoming moon mission thanks to a budget increase. "The moon's formation generated a lot of heat, and it has been gradually cooling off ever since". Scientists trying to reconstruct the Moon's origin wonder whether the same happened to the Moon, or if instead it was only partially molten, perhaps with a magma ocean over a more slowly heating deep interior. There, the biggest scarps are almost a hundred times larger than those on the moon.

"The first time humanity went to the Moon, it was under the name Apollo", NASA Administrator Jim Bridenstine told a telephone press conference Monday night.

The goal of the White House Space Policy Directive 1 is to "make America a leader in space exploration again" and to send NASA astronauts back to the Moon, and then eventually onto Mars "and the broader solar system".

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