Japan's MMX sample-return mission to the Mars moon Phobos arrives at its Tanegashima launch site on March 31, 2026. Liftoff is expected in November or December of this year. (Image credit: JAXA) Share this article 0 Join the conversation Follow us Add us as a preferred source on Google Newsletter Get the Space.com Newsletter Breaking space news, the latest updates on rocket launches, skywatching events and more!
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An account already exists for this email address, please log in. Subscribe to our newsletterJapan's Martian Moons eXploration (MMX) spacecraft has arrived at the Tanegashima spaceport ahead of launch, which will kick off an audacious mission to bag samples from Mars' moon Phobos and deliver them to Earth.
MMX recently completed its journey to the spaceport on Tanegashima island on March 31, the Japan Aerospace Exploration Agency (JAXA) announced recently on the social media platform X, and will now be prepared for a launch late this year.
— cantworkitout on April 6, 2026One sea voyage later, and the #MMX spacecraft arrived at the Tanegashima Space Center on March 31! Covering the trailer container is a sheet bearing our mission mark. We moved to the Spacecraft Test & Assembly Building 2 (STA2) and unpacked the next day. Onto launch site tests! pic.twitter.com/gdceGBt6wJ
The mission was earlier scheduled to launch in the previous launch window in 2024, but this was delayed due to issues with the H3 rocket. There had been doubt over the 2026 launch following the second failure of the H3 in seven tries in December 2025, but the issue was soon isolated as a payload fairing separation anomaly, clearing the way for MMX to proceed.
If all goes according to plan, MMX will arrive in orbit around Mars in 2027 to begin mapping and analyzing Phobos and Deimos and search for a landing site. MMX will then land on Phobos in 2029 to collect around 0.35 ounces (10 grams) of samples. The spacecraft will then leave Mars in 2030 and deliver the precious samples to Earth in 2031 for scientists to study.
The mission aims to determine if the two Martian moons, Phobos and Deimos, are captured asteroids or chunks of Mars sent into orbit by a massive impact, similar to how Earth's moon formed about 4.5 billion years ago. MMX will also seek to provide further insights into how Mars and the inner solar system developed.
MMX also carries the MMX IDEFIX rover, jointly developed by the German Aerospace Center (known by the German acronym DLR) and the French space agency Centre National d'Etudes Spatiales (CNES). The four-wheeled, autonomous 55-pound (25-kilogram) IDEFIX will land on Phobos ahead of MMX, operating in an ultra-low gravity environment to gather vital information for a safe landing.
Get the Space.com NewsletterContact me with news and offers from other Future brandsReceive email from us on behalf of our trusted partners or sponsorsThe mission is the latest in a line of Japanese sample-return projects, including the Hayabusa mission to asteroid Itokawa and Hayabusa2, which sampled the asteroid Ryugu and returned to Earth in December 2020.
Andrew JonesContributing WriterAndrew is a freelance space journalist with a focus on reporting on China's rapidly growing space sector. He began writing for Space.com in 2019 and writes for SpaceNews, IEEE Spectrum, National Geographic, Sky & Telescope, New Scientist and others. Andrew first caught the space bug when, as a youngster, he saw Voyager images of other worlds in our solar system for the first time. Away from space, Andrew enjoys trail running in the forests of Finland. You can follow him on Twitter @AJ_FI.
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