A place on the moon where gravity is abnormally concentrated. From the analysis of orbital data from the Lunar Orbiter 5 (launched August 1, 1967, and crashed into the moon on January 31, 1968), it was found that there is a heavy object with strong gravitational force in the ocean. Detailed investigations by Apollo 14, 15, and 16 revealed that there is a gravitational anomaly, that is, a concentration of mass, in craters and oceans with a diameter of more than 200 km. According to P. Muller and others from California Institute of Technology, "It seems that a meteorite is buried at the bottom of the round ocean," and this heavy object came to be called a "mascon," meaning "concentration of mass." There are several theories about the cause, including that a meteorite is buried there, or that heavy lava has erupted from the inside, but the currently most likely theory is that dense basalt and other rocks have accumulated underground. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
月面で異常に重力が大きく集中している場所。アメリカの無人探測機ルナオービター計画で,特に第5号 (1967年8月1日打上げ,68年1月 31日月面に衝突) の軌道データの分析から海の部分の中に引力の強い重量物があるらしいということがわかった。アポロ 14,15,16号の詳しい調査によって,直径 200kmより大きなクレータや海には重力異常,つまり質量の集中があることがわかった。カリフォルニア工科大学の P.ミュラーらによると「丸い形の海の底には隕石が埋っているらしい」として,この重量物を「質量の集中」という意味から「マスコン」と呼ぶようになった。その原因については,隕石が埋っているという説,内部から重い溶岩が吹出したという説などがあるが,現在では密度の高い玄武岩などが地下に集積しているという説が有力視されている。
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