Japan’s Martian Moons eXploration (MMX) Mission-INDIAN EXPRESS

Japan Aerospace Exploration Agency (JAXA) has launched the Martian Moons eXploration (MMX) mission to study Phobos and Deimos, the two moons of Mars.The mission aims to collect about 10 grams of samples from Phobos and return them to Earth by 2031.

About Phobos and Deimos

• Phobos and Deimos are the two natural satellites of Mars, discovered by Asaph Hall in 1877.
• Their origin is still uncertain, with two major theories:
  • Captured-Asteroid Theory: They may be asteroids captured by Mars’ gravity.
  • Giant-Impact Theory: They may have formed from debris produced after a large body collided with Mars.
• Studying their composition can therefore provide important clues about the formation and early evolution of Mars.

About the MMX Mission

• MMX is a sample-return mission led by JAXA.
• The spacecraft is expected to reach Mars around August 2027 and enter a quasi-satellite orbit around Phobos.
• It will study Phobos’ surface, topography and chemical composition, identify a suitable landing site, collect samples and begin its return journey.
• The mission will also conduct a flyby of Deimos before returning to Earth in 2031.

Mission Configuration

• The spacecraft consists of:
  • Propulsion Module
  • Exploration Module
  • Sample-Return Module
• It carries 13 scientific instruments, including cameras and spectrometers.
• It also carries the IDEFIX rover, jointly developed by CNES (France) and DLR (Germany), which will be deployed on Phobos before the main spacecraft lands.

Significance of the Mission

• Origin of Martian Moons: Helps determine whether Phobos and Deimos are captured asteroids or products of a giant impact.
• Understanding Mars: Their material may provide clues about the formation and geological history of Mars.
• Future Human Missions: MMX will test technologies such as autonomous navigation and landing in extremely weak gravity.
• Strategic Importance of Phobos: Its very low gravity could make it a possible staging point for future crewed Mars missions, requiring much less fuel for landing and take-off.
• International Cooperation: Though led by JAXA, MMX involves cooperation with agencies such as NASA, CNES, DLR and the Australian Space Agency.

MMX combines planetary science, sample-return technology and future Mars-exploration objectives, with Phobos at the centre of efforts to understand both the origin of Mars’ moons and the evolution of the Martian system.