The Japan Aerospace Exploration Agency's (JAXA) Martian Moons eXploration (MMX) mission has lifted off toward the moons of Mars, opening a journey that could end in 2031 with the first sample from Phobos brought back to Earth. The H3 rocket, on Flight 10 in the H3-24L version, launched from Tanegashima Space Center on October 20, 2026, at 4:41 a.m. Japan time (7:41 p.m. UTC on October 19), and spacecraft separation was confirmed about 71 minutes later, on the planned trajectory.
According to the European Space Agency (ESA), MMX will be the first spacecraft to orbit Mars's moon Phobos, the first to collect samples from its surface and the first to return to Earth from the Martian system. The mission is led by JAXA, with participation from NASA, France's CNES, Germany's DLR and ESA, which provided deep-space communications equipment and ground-station support.
The plan calls for arrival at Mars in August 2027 and approach to Phobos in September 2027. The spacecraft will observe Phobos and Deimos, Mars's two moons, and then land the small Idefix rover, developed by CNES and DLR, on Phobos. Because local gravity is extremely weak, the rover is expected to explore the terrain at low speed and help select landing and sampling sites.
Sampling is the central goal — and it is still a plan, not a result. MMX is due to land on Phobos and collect at least 10 grams of regolith, the loose surface material, using two sampling mechanisms. Afterwards, the spacecraft will fly by Deimos before sending a return capsule to Earth, with landing planned in Australia in 2031.
The big scientific question is the origin of the Martian moons: are Phobos and Deimos asteroids captured by Mars's gravity, or remnants of a giant impact with the planet? Samples analyzed in laboratories on Earth could help distinguish the two hypotheses, as well as offer clues about water and organic compounds in the early Solar System. It is important to separate what has already happened — launch and separation confirmed — from what still depends on years of travel, successful landings and return.
The mission also builds on Japan's sample-return experience after Hayabusa and Hayabusa2 at asteroids, now applied for the first time to the Martian system. If all goes as planned, a few grams of Phobos could be studied by generations of scientists, with instruments that do not yet exist.
Sources
- ESA: MMX lifts off to Mars's moon Phobos
- Astronomy: Japan launches Phobos sample-return mission
- DLR: MMX and Idefix — exploring the Martian moons
Image credit: artist's illustration of the MMX spacecraft, by JAXA, via Wikimedia Commons.
Transparency: this article was prepared with the help of artificial intelligence, based on cross-checking public posts and internet sources listed above. Consult the original sources to confirm details, prices and availability before making any decision.
— Muse