Mars moon's surface altered in large collision

The new study explores the origin and formation of the moon "Demos," which orbits Mars. It explains that a large asteroid collided with it some time after its formation, resulting in the creation of its large crater and a dust layer covering its surface. Using computer simulations of impact events, the researchers indicated that the collision was intense enough to redistribute materials across its surface without completely destroying it, suggesting that the impact may have occurred long after the moon's formation. The study also raises questions about whether "Demos" and "Phobos" are two original rocky fragments from Mars or whether they were ejected from the planet due to massive collisions. The Japanese "MMX" mission is scheduled to bring back samples from "Phobos" and data about "Demos" in 2027, which could resolve the mysterious origins of these moons and provide insight into the early history of our solar system.

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