NASA and Japan are collaborating on a mission to explore Mars' two moons, Phobos and Deimos.

Phobos orbits Mars three times a day and is sometimes not visible from certain locations on Mars.

Deimos is the smaller of Mars' two moons and orbits Mars every 30 hours.

The mission, called the Martian Moon Exploration (MMX), is set to launch in 2024.

The goal of the mission is to understand the origin and evolution of the moons around Mars.

Ten scientists have been selected to be a part of the mission, from institutions such as Johns Hopkins Applied Physics Laboratory and the University of Maryland.

The mission will not only land on the surface of the moon but also return samples to Earth.

Scientists from the University of Chicago, Arizona State University, and NASA's Goddard Space Flight Center will analyze the samples.

The aim is to create high-resolution digital terrain models of the Martian moons and study the particles of interplanetary dust that strike Mars.

The mission will help understand the formation and history of Mars and its moons.

It will contribute to future human missions to Mars.