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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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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
。いつまでも若々しく健康でいるためには、何を食べるべきか。

B | 老年科専門医で、名古屋学芸大学教授の下方浩史さんは「筋肉や血管の衰えを防ぐには、タンパク質の摂取が欠かせない。卵やサバの缶詰を上手に活用してほしい」という――。(第3回) 【図表をみる】医学博士の大学教授が進める“1日4食”の1週間献立表　※本稿は、下方浩史『90歳まで健康長寿』(文春新書)の一部を再編集したものです。

C | ■「1日4食」が老いた血管を守る　私は普段から、さまざまな「健康長寿への道」を紹介しています。一方で、「そうは言うけど、挙がった食品を毎日全部食べるのは難しい」という声が聞こえてくるようです。　そこで、ここまでのメソッドをふまえて1週間分の献立を作ってみようと考えました。一般的に1日3食を規則正しく食べる生活は、栄養を補給して体のリズムを整える上で極めて重要です。　ただ、歳を重ねると胃腸が衰え、消化能力が落ちてくる。それを放置して1回の食事量が減ったままにしておくと、必然的に摂る栄養の量が減ってしまう。そこで私が提唱しているのが、食事の回数を1日4食に増やすことです。　ポイントとなるのは、食事の時間です。何をいつどのように食べるかを考える「時間栄養学」というものがあります。

D | 　体の中の時間の流れを調整する体内時計がリズムを刻むためには、食事が重要な役割を果たしています。乱れた食生活は体内時計を狂わせてしまう。体内時計を乱す食生活の1つが欠食です。食事を1度抜くだけでも、様々な疾患の発症リスクが上がってしまいます。　加齢によって血管が硬くなっている人が1食抜いてしまうと、次の食事で大食いをしたり、早食いをしたりして糖質の吸収速度が上がります。すると、血糖値が急激に上がって急降下する血糖値スパイクを招き、糖尿病を発症するリスクが高まるのです。