Japan prepares first mission to return samples from a Martian moon
Japan is preparing to launch the Martian Moons eXploration spacecraft on a five-year mission to collect material from Phobos and return it to Earth. The launch is scheduled for 4:41 a.m. Japan time on Tuesday, 20 October, aboard an H3 rocket from the Tanegashima Space Center — 19 October in Europe and the Americas.
What matters
MMX could answer a fundamental question about the formation of Mars’s moons and advance sample-return technology. Every milestone remains prospective until launch, landing, collection and return are completed.
The Japan Aerospace Exploration Agency says MMX will reach the Mars system in 2027, study Phobos and Deimos, land on Phobos and collect at least 10 grams of surface and subsurface material. A small rover named Idefix, developed with French and German partners, will scout the moon’s terrain. The return capsule is targeted to arrive on Earth in 2031. NASA and the European Space Agency are among the international partners.
If the mission succeeds, it will be the first to return samples from a Martian moon. Scientists hope the material will help resolve whether Phobos and Deimos are captured asteroids or debris from a giant impact, and illuminate how water and organic material moved through the early solar system. The timetable remains a plan: launch, landing and sample recovery each present substantial technical risks.
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