Japan Launches Historic Mission to Collect Samples From Mars’ Moon Phobos

TANEGASHIMA, Japan — Japan has launched a landmark space mission aimed at collecting samples from one of Mars’ moons, marking a major step in scientists’ efforts to understand how the Red Planet and its surrounding environment formed.

The unmanned Martian Moons eXploration (MMX) spacecraft lifted off aboard Japan’s H3 rocket from the Tanegashima Space Center at 4:41 a.m. local time on Tuesday, according to a live broadcast by the Japan Aerospace Exploration Agency (JAXA).

More than an hour after launch, JAXA confirmed that the spacecraft had successfully separated from the rocket and was beginning its journey towards the Martian system.

The agency also reported receiving signals from the probe, indicating that it was operating normally after separation.

“I'd dreamt of this day, so I'm incredibly happy,” JAXA scientist Mari Aida said during the broadcast. “Right now I feel really relieved.”

The launch attracted thousands of viewers online, with supporters posting messages of encouragement despite the early morning hour in Japan.

Spacecraft Targets Phobos for Sample Collection

The MMX spacecraft is expected to reach the vicinity of Mars around August 2027, where it will study the planet’s moons, Phobos and Deimos.

Its main objective is to collect at least 10 grams of material from the surface of Phobos during a planned mission lasting approximately three years in the Martian system.

If successful, the mission would provide scientists with material collected directly from a Martian moon for detailed analysis on Earth.

Researchers hope the samples will help answer fundamental questions about the formation of Mars and its moons, including whether Phobos and Deimos originated from material ejected during a major collision with Mars or are asteroids captured by the planet’s gravity.

Distinguishing between these competing theories could improve scientific understanding of how rocky planets and their surrounding environments developed in the early Solar System.

European Rover to Test Phobos’ Surface

The mission includes a French-German rover named IDEFIX, after the French name for Dogmatix, the canine companion of comic-book character Asterix.

The rover is designed to travel across the surface of Phobos and conduct observations that will help scientists understand its terrain and assess conditions for landing.

Its findings are expected to contribute to the mission’s surface operations and improve knowledge of the small moon’s physical characteristics.

MMX will also observe Deimos, Mars’ second and smaller moon, although the spacecraft will not attempt to land on it.

The combination of orbital observations, surface exploration and sample collection is intended to provide a more comprehensive picture of the Martian moons than remote observations alone can offer.

Scientists Hope to Unlock Secrets of the Solar System

JAXA says the mission could help establish how Mars and its moons formed, providing important clues about the early history of the Solar System.

Under the giant-impact hypothesis, Phobos and Deimos may have formed from debris produced when a large celestial body collided with Mars.

The alternative capture hypothesis suggests that the moons are asteroids that were drawn into orbit by Mars’ gravitational pull.

Analysing samples from Phobos could help scientists determine which explanation is more consistent with the moons’ composition and geological history.

The findings may also contribute to research into how potentially habitable environments emerged on the terrestrial planets Mercury, Venus, Earth and Mars.

Nicky Fox, administrator of NASA’s Science Mission Directorate, described the mission’s scientific potential as significant.

“The samples from MMX will bring forth paradigm-shifting science for generations to come, especially as NASA prepares to send the first humans to Mars,” Fox said in a message broadcast during JAXA’s live coverage.

Mission Could Support Future Human Exploration

Beyond investigating the origins of the Martian moons, MMX is expected to examine whether Phobos could serve as a potential staging point for future missions to Mars.

JAXA has identified the possibility of using Phobos as a “natural space station” as one area of interest, with the mission intended to help establish requirements for journeys involving crewed exploration of the Red Planet.

Studying the moon’s surface, environment and operational conditions could provide information relevant to future spacecraft, robotic systems and mission planning.

Although the mission is not designed to transport humans, its findings could help scientists and engineers evaluate options for future exploration of the Martian system.

Global Competition to Return Mars Samples

Japan’s mission comes as space agencies around the world pursue plans to bring material from Mars and its moons back to Earth.

NASA’s Perseverance rover has been exploring Mars since 2021 and has collected samples for potential return. However, NASA’s planned Mars Sample Return programme has faced major funding and technical challenges, with the original approach undergoing significant changes.

China is also developing its Tianwen-3 Mars sample-return mission, which has been scheduled for launch around 2028, with a potential return of samples as early as 2031.

The MMX mission differs from these efforts because it targets Phobos rather than collecting material directly from the Martian surface.

Returning samples from a Martian moon could nevertheless provide valuable evidence about the planet’s history, particularly if the material contains clues about the formation of the moons or the movement of material between Mars and its surrounding space.

A Major Step in Planetary Science

With the spacecraft now on its journey, scientists will spend the coming months preparing for its arrival in the Martian system and the complex operations required to collect samples from Phobos.

The mission’s success could expand humanity’s understanding of the Solar System’s formation while providing new information to support future robotic and crewed exploration.

For Japan, MMX represents a major scientific undertaking. For the international space community, it offers an opportunity to study a little-understood part of the Martian system and potentially bring back material that could answer questions about the origins of planets and the conditions that make life possible.