Japan’s space agency has announced plans to mount the first mission aimed at returning samples from Phobos, one of the two small, irregularly shaped moons that orbit Mars. The agency says the mission will take about five years from launch to the return of material to Earth.
Phobos and its smaller companion, Deimos, have long intrigued planetary scientists because their origins remain uncertain. Some theories propose they are captured asteroids, while others suggest they formed from the same material as Mars; recovered samples could help resolve which scenario is correct.
Scientists involved in the project describe Phobos as “one of the most important unclimbed mountains in the solar system,” reflecting both its scientific value and the practical challenge of operating on such a small, potato-shaped body. Researchers hope that analysis of returned rock and dust will reveal details about the moons’ composition and the conditions in the early solar system, including whether organic molecules or other ingredients relevant to the emergence of life are present.
The mission marks a milestone in planetary exploration as the first attempt to collect material from a Martian moon and bring it back for laboratory study on Earth. While the agency has outlined the broad goals and timeline, it has not yet released detailed technical or scheduling information. Scientists and mission planners say the returned samples could provide a new window into Mars’s history and the processes that shaped small bodies across the solar system.