Japan’s MMX mission will reveal the origins of weird Martian moons

Although Phobos and Deimos may look like lumpy space potatoes, they’re actually moons of Mars. No one knows how they formed, but a newly launched spacecraft should soon offer answers

日本于10月19日发射MMX探测器，计划在火卫一着陆采样并于2031年将样品带回地球。文章围绕火卫一和火卫二的成因，梳理了俘获小行星、撞击溅射物质聚合等多种假说及其证据与疑点。