Japan’s MMX Mission Heads to Phobos to Retrieve Martian Moon Samples

Japan’s Martian Moons eXploration (MMX) spacecraft has left Earth and is now en route to Phobos, the larger of Mars’ two moons. The probe is scheduled to enter orbit around Phobos later this year, where it will conduct detailed mapping before attempting to collect surface material.

The mission’s primary goal is to retrieve and return samples from Phobos to Earth. Scientists hope the material will shed light on long‑standing questions about how the Solar System formed, including whether Phobos is a captured asteroid or the result of a giant impact on Mars.

MMX will use a small lander to touch down on the moon’s surface, gather up to 10 grams of regolith, and store it in a sealed capsule. After the collection, the spacecraft will depart Phobos, head back toward Earth, and release the capsule for recovery in the Pacific Ocean.

Why It Matters

Understanding Phobos’ composition informs planetary science worldwide, offering insights that could benefit research programs in the United States and Europe.