According to some pictures captured by NASAs Lunar Reconnaissance Orbiter, the moon is gradually shrinking and leading to wrinkles in its crust and moonquakes. NASA even stated that the moon’s interior is slowly cooling down; resulting in withering up likes a raisin.
Over the last several hundred million years, it has become about 150 feet “scrawny”, beginning to develop “wrinkles,” In a post, the agency compared the contraction to a grape shrinking into a raisin. It stated that just as a grape puckers as it shrinks down to a raisin, the Moon is also developing wrinkles while it shrinks. NASA stated that the moon doesn’t have tectonic plates. While the moon’s interior gets cooled down, over the hundred million years, this result in the moon’s surface develop wrinkle and shrink.
Unalike the flexible skin on a grape, the Moon’s surface crust is breakable, so it breaks as the Moon shrinks. This is creating stair-step cliffs known as ‘thrust faults’, where one section of crust is lifted up over an adjoining part of the crust.
These faults are also “probably resulting in moonquakes”, which can be as strong as a magnitude-5 quake on the Richter scale, NASA quoted Thomas Watters, a senior scientist at the Smithsonian’s National Air and Space Museum.
NASA stated that the lifted-up crusts usually measure tens of meters high and extend for a few miles. In 1972, Apollo 17 astronauts ascended one such cliffs and a photo of the Lee-Lincoln fault scarp that measures about 80 meters (262 feet) high was taken. Presently, there are thousands of cliffs spread across the moon’s surface, averaging a few miles long and tens of yards high. The orbiter has been able to take photos of over 3,500 of them since 2009.