Japan's mission to Mars' moons could answer a decades old question dividing the origins of Phobos and Deimos between two conflicting theories, and make history as the first spacecraft to return to Earth from orbit of the Red Planet.
Source: [Space.com](https://www.space.com/space-exploration/missions/returning-samples-from-a-mars-moon-inside-the-science-of-japans-bold-mmx-mission)