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2h ago

Japan’s MMX Mission Departs for Phobos Sample-Return

A successful mission would return the first samples from Mars’ moons, testing low-gravity landing and sampling methods while advancing international science collaboration.

Employees of Japan Aerospace Exploration Agency and others celebrate as a Japanese spacecraft launched aboard an H3 rocket successfully separated as planned, at the Tanegashima Space Center in Kagoshima prefecture, southern Japan, Tuesday Oct. 20, 2026. (Naoki Hiraoka/Kyodo News via AP)
This photo provided by NASA/JPL-Caltech/University of Arizona, taken with NASA's Mars Reconnaissance Orbiter, shows Phobos, one of Mars' moons, on March 23, 2008. (NASA/JPL-Caltech/University of Arizona via AP)
An H3 rocket lifts off from the Tanegashima Space Center in Kagoshima prefecture, southern Japan, Tuesday Oct. 20, 2026. (Naoki Hiraoka/Kyodo News via AP)
An H3 rocket lifts off from the Tanegashima Space Center in Kagoshima prefecture, southern Japan, Tuesday Oct. 20, 2026. (Naoki Hiraoka/Kyodo News via AP)

Overview

  • JAXA launched the Martian Moons eXploration (MMX) spacecraft and it is now on an interplanetary cruise to Mars that leads to Phobos-focused operations.
  • The mission carries a main orbiter, a small lander and the French-German rover Idefix, which will scout Phobos for about 100 days to help select a safe sampling site.
  • MMX aims to collect at least 10 grams of regolith from Phobos through one or more touch-downs and deliver a sealed sample capsule back to Earth in 2031.
  • The campaign is an international partnership involving JAXA, NASA and European agencies, is reported at about $578 million, and plans to recover the capsule in South Australia’s Woomera area.
  • Success would settle key questions about whether Mars’ moons formed from impact debris or are captured asteroids and would advance low-gravity landing and sample-return techniques for future deep-space missions.