JAXA Launches MMX Probe to Explore Mars Moons
The Japanese mission aims to collect samples from Phobos to uncover clues about the origins of the Solar System.
Updated on Oct. 19, 2026 in Space
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JAXA successfully launched its Martian Moons eXploration (MMX) probe from the Tanegashima Space Centre atop an H3 rocket. The craft is now en route to Mars to conduct a multi-year study of its moons, Phobos and Deimos.
Why it matters
The mission seeks to retrieve at least 10g of surface material from Phobos to better understand the early history of our Solar System. Additionally, researchers will evaluate whether the moon could function as a natural space station for future human missions to Mars.
The MMX probe will conduct observations and collect samples over a three-year period within the Martian system. The mission includes the deployment of a French-German rover named IDEFIX to assist in the surface investigation.
The players
JAXA
JAXA is the Japan Aerospace Exploration Agency responsible for the nation's space research and development programs.
IDEFIX
IDEFIX is a French-German rover designed to conduct surface exploration and data collection on the Martian moons.
The details
The mission is an international collaboration involving space agencies from the United States and Europe. After separating from its launch vehicle, the probe is expected to begin its primary scientific operations upon reaching the Martian environment.
Timeline
October 19, 2026: The MMX probe launched on an H3 rocket.
August 2027: The probe is scheduled to arrive at Mars.
2028: China plans to launch the Tianwen-3 spacecraft.
2031: China aims to return Mars samples to Earth.
The Big Picture
The MMX mission marks a paradigm shift in how space agencies approach Martian moon research by attempting direct surface sampling rather than relying solely on orbital remote sensing. This strategy aligns with the broader global goal of returning geological material to Earth, mirroring the operational trajectory of the Tianwen-3 mission.
The data collected regarding Phobos may eventually determine if this moon can serve as a natural waypoint for future crewed exploration of the red planet. These findings are expected to influence long-term planning for international human spaceflight missions.
The takeaway
This mission demonstrates the increasing importance of international partnerships in conducting complex deep-space exploration. Understanding the composition of Martian moons could provide scientists with a unique timeline of the origins of our Solar System.
What happens next
The probe is expected to arrive near Mars in August 2027 to begin its three-year observational phase.
Further reading
For more information on ongoing astronomical missions, visit the Space section.
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