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阅读时间：3分10秒
P1：
研究新发现-a new radar study demonstrating that the core of the solar system’s innermost planet is at least partially molten
该研究影响：
-settles a long-simmering debate
-provide insight about how the solar system created its planets
传统观点：mercury ought to have cooled and solidified long ago.
P2：探测发现质疑传统观点
-一方面Mercury has a magnetic field usually generated by the sloshing of charged material within a liquid core
-另一方面the magnetic field is a remnant in the crust, frozen in place when Mercury’s core solidified.
P3：新研究
-a close study of Mercury’s spin could determine whether the planet has fluid in its core
-Solar gravity has a greater effect on a planet’s spin if the core is at least partially liquid.
P4：
研究结果-variations in the spin were about double what would be expected if Mercury were solid
研究结论-t minimum, the outer core of Mercury—the boundary between the heart of the planet and its overlying mantle—must be liquid
旧观点-Mercury remains molten because sulfur infiltrated the planet’s iron core and lowered its melting temperature
新观点：
-the high temperature would have kept sulfur as a vapor and so prevented it from being incorporated into the planet
-Mercury, and perhaps other planets, grabbed sulfur and other material from beyond their immediate surroundings
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发表于 2022-7-25 21:23:01
