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New advances in lunar soil research offer scientific evidence to unravel mystery of moon’s 'two faces'_我的网站

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一 | LOS ANGELES -- Sales of previously occupied U.S. homes fell for the fourth month in a row in September, held back by surging mortgage rates and a thin supply of properties on the market.Existing home sales fell 2% last month from August to a seasonally adjusted annual rate of 3.96 million, the National Association of Realtors said Thursday. That’s just above the 3.9 million unit pace that economists were expecting, according to FactSet.Sales sank 15.4% compared with the same month last year and are down 21% through the first nine months of the year versus the same period in 2022.Despite the housing market slump, home prices kept climbing versus a year ago. The national median sales price rose 2.8% from September last year to $394,300. It slipped 3.1% from August.“Clearly, the story of limited inventory and rising and rising mortgage rates continues to hinder the home sales market,” said Lawrence Yun, the NAR’s chief economist.The weekly average rate on a 30-year mortgage moved above 7% in August, when many of the home sales that were finalized in September would have gone under contract. It has remained above that threshold since, surging last week to 7.57%, the highest level since 2000, according to mortgage buyer Freddie Mac.High rates can add hundreds of dollars a month in costs for borrowers, limiting how much they can afford in a market already out of reach for many Americans. They also discourage homeowners who locked in rock-bottom rates two years ago from selling.While surging mortgage rates have shut out many prospective buyers, a chronic shortage of homes for sale continues to keep the market competitive, especially for the most affordable homes.Homes sold last month typically within just 21 days after hitting the market, and about 26% of homes sold for more than their list price, the NAR said.All told, there were 1.13 million homes on the market by the end of last month, up 2.7% from August, but down 8.1% from September last year, the NAR said. That amounts to just a 3.4-month supply, going by the current sales pace. In a more balanced market between buyers and sellers, there is a 4- to 5-month supply.。

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Lunar soil Photo: IC
Chinese scientists have made new progress in the study of lunar soil samples returned by the Chang'e-6 mission, providing fresh evidence to the striking differences between the moon's near and far sides, which have long puzzled scientists.
Because the moon is tidally locked to Earth, its rotation period matches its orbital period, meaning the same side always faces Earth. The moon's near side features vast dark basaltic plains known as lunar maria, while its far side is dominated by bright highlands with far fewer maria, creating a striking contrast between the two sides. Why does the moon have such "two faces"?
Scientists studying the moon's early formation and evolution have long used the lunar magma ocean model as a basic framework. Under the model, the chemical and isotopic characteristics of different types of lunar magma can be explained by the mixing of different components in varying proportions after the magma ocean cooled, Guangming Daily reported on Saturday.
However, previous lunar samples were collected only from the moon's near side, while significant differences exist between the near and far sides in their topography, composition and internal structure.
Against this backdrop, the research team from Institute of Geology from Chinese Academy of Geologist Sciences studied feldspathic impact-melt rocks in lunar soil samples returned by the Chang'e-6 mission. Using China's first independently developed ion probe system, researchers conducted a comprehensive analysis to test the lunar magma ocean model and examine how large impacts reshaped reservoirs in the lunar crust and mantle.
Through high-precision analyses, the team identified key clues to the moon's evolutionary history, suggesting that the stark differences between its near and far sides may be linked to the ancient giant impact that formed the South Pole-Aitken Basin.
The study found that the massive impact continued to profoundly reshape the lunar crust and upper mantle after the lunar magma ocean had solidified, fundamentally altering the material composition of parts of the moon's far side.
The findings add to the traditional lunar magma ocean model, suggesting that the formation and preservation of the moon's crustal and mantle reservoirs may have varied significantly from region to region and cannot be fully explained by a single, uniform model of primordial magma-ocean differentiation.
The research provides new scientific evidence for understanding the differences between the moon's near and far sides, while offering fresh insights into the moon's complex evolutionary history, according to Guangming Daily.
Global Times
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