Japan Launches First Mission to Return Samples from Mars Moon Phobos

Japan is preparing to launch the uncrewed Martian Moons eXploration (MMX) probe, a mission designed to collect surface material from Phobos, one of Mars' two moons, and return it to Earth. Scheduled for launch at 4:41am from the Tanegashima Space Center aboard the H3 rocket, the mission aims to complete the world’s first round trip to the Martian moons. Led by the Japan Aerospace Exploration Agency (JAXA), the project is a multinational effort involving space agencies from the United States and Europe, as well as university researchers and private technology firms.

Scientific Objectives and Theories

A central scientific dispute has divided astrophysicists regarding the formation of the Martian moons. One theory suggests they are captured asteroids from the outer asteroid belt, while another proposes they are remnants of a colossal ancient impact between Mars and another celestial body. Resolving this dilemma is expected to help rewrite models of planetary evolution.

Yasuhiro Kawakatsu, project manager of the MMX mission, emphasized the significance of the target. “Despite their potential importance, Martian moons have never been fully investigated,” Kawakatsu said. “They are known as the most important unclimbed mountains in the solar system.”

Kiyoshi Kuramoto, principal investigator of the mission, stated that analyzing soil samples could resolve the mystery. “We can almost certainly come to a conclusion by analysing soil samples,” Kuramoto said. JAXA estimates that approximately 0.1% of the samples collected from Phobos could consist of Martian material, as Phobos orbits closer to Mars than Deimos.

Mission Architecture and Timeline

The MMX spacecraft comprises three modules dedicated to propulsion, exploration, and return. Only the return module will travel back to Earth carrying the collected samples. The journey is estimated to cover 500 million to 600 million km. Following its launch, the spacecraft is expected to reach the Mars region around August 2027. It will spend approximately three years observing Phobos, gathering scientific data, and collecting samples before beginning its return journey to Earth in 2031.

The spacecraft will carry 13 scientific instruments, including a rover jointly developed by France and Germany named Idefix, NASA’s sampling equipment, and a gamma-ray measuring instrument. The Idefix rover is expected to land on Phobos ahead of the main spacecraft during its planned 100-day mission around 2029 to examine the surface and support subsequent sampling operations.

Technical Challenges and International Collaboration

Landing on Phobos presents significant technical difficulties because its gravity is only about one two-thousandth of Earth’s gravity. To prevent excessive bouncing during touchdown, the spacecraft’s exploration module has four-legged landing gear fitted with shock absorbers. According to JAXA, the Idefix rover will move “at a snail’s pace” to maintain traction in the low-gravity environment.

The mission involves collaboration with France's National Center for Space Studies (CNES), the German Aerospace Center (DLR), NASA, and the European Space Agency (ESA). Makoto Arita, project manager of JAXA’s H3 rocket team, expressed enthusiasm for the endeavor. “Being able to be involved in such a grand mission is incredibly exciting,” Arita told reporters two days before the launch.

Why it matters

The MMX mission represents a significant step in deep-space exploration, offering the first opportunity to analyze pristine regolith from the Martian moons in terrestrial laboratories. Beyond resolving questions about the origins of Phobos and Deimos, the data gathered will inform future human exploration architectures. Scientists believe the findings could provide valuable information for future Mars exploration, including the potential use of Martian moons as bases for future human missions. The return of samples to Australia in 2031, followed by transport to Japan for analysis, marks a milestone in international space cooperation and planetary science.

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Sources

• ft.com: Subscribe to read
• cristinaiglesias.com: Japan Readies Historic Mars Moons Mission: MMX Probe Targets First-Ever Sample Return to Earth | Collin Rugg News
• freepressjournal.in: Japan To Launch World’s First Mission To Bring Back Samples From Mars Moon Phobos
• zoomnews.in: Japan MMX Mission: First Ever Mission to Mars Moon Phobos Launching Oct 20

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