Japan has launched a spacecraft on a pioneering mission to explore the two moons of Mars and bring samples back to Earth, marking a major step in planetary exploration. The spacecraft, launched before dawn on Tuesday from Tanegashima Island, is part of a mission led by the Japan Aerospace Exploration Agency (JAXA). The five-year project aims to investigate the origins and characteristics of Phobos and Deimos, the two small moons orbiting the Red Planet. The mission will attempt to deploy a robotic lander and a rover on Phobos, the larger and closer of Mars' two moons. Scientists plan to collect samples from the moon's surface and return them to Earth for detailed laboratory analysis. The mission represents an ambitious effort to study celestial bodies that remain poorly understood despite decades of exploration of Mars itself.

By examining material collected directly from Phobos, researchers hope to obtain information that cannot be gathered through remote observations alone. JAXA is leading the mission with the participation of five space agencies, bringing together international expertise for the complex undertaking. The spacecraft is expected to travel for several years before reaching the Martian system, where it will conduct observations and prepare for surface operations. Landing on Phobos presents significant technical challenges because the moon has extremely weak gravity and an irregular surface. The spacecraft and its robotic equipment will need to operate carefully to collect samples while maintaining sufficient control to complete the mission's objectives.

Although several countries have successfully sent spacecraft to Mars, landing on either of its moons remains an unachieved milestone. NASA has successfully landed nine spacecraft on Mars over approximately five decades, while China also achieved a successful Mars landing in 2021. However, no space agency has yet landed a spacecraft on Phobos or Deimos. The Japanese mission therefore seeks to extend planetary exploration beyond Mars itself and investigate two neighbouring bodies that could hold important clues about the evolution of the Martian system. Phobos and Deimos have long attracted scientific interest because their origins remain uncertain. One possibility is that the moons are asteroids captured by Mars' gravity, while another theory suggests that they formed from debris produced by a major impact involving the planet. Studying their composition could help researchers determine which explanation better fits the available evidence.

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Samples collected from Phobos could provide direct information about the materials that make up the moon, allowing scientists to compare them with known asteroids and other bodies in the Solar System. The mission also seeks to improve understanding of the relationship between Mars and its moons. Phobos orbits relatively close to the planet, while Deimos follows a more distant path. Both are considerably smaller than Earth's Moon and have different orbital characteristics. Although the spacecraft's planned surface operations focus on Phobos, observations of the Martian system could contribute to broader research into the moons' physical properties and history. Returning samples to Earth would allow scientists to use advanced analytical equipment that cannot be carried aboard a spacecraft. Bringing material back from another planetary body is a particularly demanding task, requiring a spacecraft to reach its destination, conduct surface operations, collect samples and complete the journey home.

The samples could help researchers investigate the chemical and mineral composition of Phobos, providing evidence about its formation and subsequent evolution. Scientists would also be able to examine the material for clues about the early history of the Solar System. The mission's success will depend on the spacecraft completing each stage of the operation over several years. Japan's latest launch highlights the growing role of international cooperation in deep-space exploration. By combining expertise from multiple space agencies, the project aims to achieve a feat that has not previously been accomplished. If successful, the mission would deliver the first samples collected from a moon of Mars, giving researchers new material to study and potentially resolving long-standing questions about Phobos and Deimos. It would also mark a significant expansion of humanity's ability to explore and retrieve material from distant planetary bodies.

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