Phobos and Deimos, the two moons of Mars, are believed to have originated in the fragmentation of a primordial body while in a synchronous orbit between 1 and 2.7 × 10 9 years ago. The recession of Deimos to its current position is consistent with the hypothesis that cosmological expansion, as described by the Hubble velocity‐distance relationship, operates at the local level.
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Leslie A. King (2024) studied this question.
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