The press said a crater explains where Phobos came from. The paper said the moon's origin is still unsolved.
A short post about reading past a headline, using a real one. Phobos is the larger of Mars's two moons. It is about 22 km across, it orbits closer to Mars than any other moon orbits its planet (once every 7h39m), and it is spiralling inward. Eventually it will break up or crash. It also has a 9 km crater, Stickney, and a gravity problem. Phobos's measured gravity field departs from what a body of…
A post titled "The press said a crater explains where Phobos came from" uses the headline to illustrate the difference between summary coverage and the actual content of a peer-reviewed paper. Phobos, the larger of Mars' two moons, is 22 km across and orbits closer to Mars than any other moon orbits its planet. The 9 km Stickney crater on Phobos and its gravity anomaly are key points.
While the crater may explain Phobos' origin, the paper does not provide a definitive solution. Instead, it takes an existing hypothesis about a denser patch beneath the crater and models its potential impact on the observed gravity anomaly. The paper's prediction is that a compressed zone under Stickney could account for 7% of Phobos' total volume, but it remains a hypothesis awaiting direct measurement of Phobos' interior.
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