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Mercury’s thin, dense crust

Mercury is small, fast and close to the sun, making the rocky world challenging to visit. Only one probe has ever orbited the planet and collected enough data to tell scientists about the chemistry and landscape of Mercury’s surface. Learning about what is beneath the surface, however, requires careful estimation. ...

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In Tangled Afghan War, a Thin Line of Defense Against ISIS

Advertisement KHOGYANI, Afghanistan — When the American military dropped the largest bomb in its arsenal on an Islamic State cave complex here in eastern Afghanistan in April, the generals justified it as part of a robust campaign to destroy the group’s local affiliate by year’s end. Its force had been ...

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