Japan Launches Ambitious Mission to Collect Samples from Martian Moon Phobos
The MMX spacecraft aims to gather at least 10 grams of Martian moon material for return to Earth by 2031, potentially answering questions about the formation of Mars and the solar system.
Japan has launched an ambitious five-year mission to collect soil samples from Phobos, one of Mars's two moons, and return them to Earth. The Martian Moons Exploration (MMX) spacecraft blasted off on an H3 rocket from the Tanegashima Space Center, embarking on a 300-million-mile journey.
The MMX mission, costing approximately £262 million, is designed to land on Phobos, scoop up at least 10 grams of dust and rock, and bring the material back to Earth by 2031. Scientists anticipate that these samples will provide crucial insights into the formation of Mars and the wider solar system, and potentially shed light on the origins of life.
One of the key scientific objectives is to resolve a long-standing debate about Phobos's origin. Researchers aim to determine whether the moon is an asteroid captured by Mars's gravity or the remnant of a colossal collision involving the Red Planet. The samples collected are expected to offer clues to clarify the evolution of Mars and the solar system, and explore the early stages of life.
The MMX spacecraft comprises three components: a propulsion module for transit to Mars, an exploration module equipped with sample collection tools, and a return module to deliver the samples to Earth. After its interplanetary journey, the spacecraft will enter orbit around Phobos.
In early 2029, a small, microwave-sized rover is slated to descend onto the moon's surface for a 100-day exploration. The data gathered by the rover will help identify the optimal landing site for the main exploration module. Once a suitable location is identified, the spacecraft will land on Phobos for approximately two and a half hours to collect material. Scientists aim to collect samples from one or two distinct areas to gain a comprehensive understanding of the moon's composition.
MMX will employ two collection methods: a C-sampler capable of drilling up to 0.8 inches beneath the surface and a P-sampler that uses a burst of nitrogen gas to propel dust and small rocks into a collection chamber. The spacecraft is outfitted with 13 scientific instruments, including high-resolution cameras, a laser altimeter for 3D mapping, a spectrometer for mineral analysis, and a detector to determine its chemical makeup. The mission will also conduct remote observations of Mars's smaller moon, Deimos.
Upon successfully gathering the samples, the MMX spacecraft will depart the Martian system and head back to Earth, with an expected arrival in 2031. As it nears Earth, a capsule containing the samples will be released, re-entering the atmosphere and parachuting to a landing in the Australian outback. The capsule will then be recovered and transported to Japan for detailed laboratory analysis. This approach allows for more sophisticated analysis than is possible in space, as Earth-based instruments are often too large or sensitive for spacecraft.
Scientists chose Phobos as the exploration target because Mars's strong gravity poses significant challenges for landing and sample return missions. Moreover, due to Phobos's proximity to Mars, it is theorized that the moon may contain fragments of the Red Planet itself, blasted from its surface by asteroid impacts over billions of years. The European Space Agency (ESA) has contributed communication equipment for the mission. Experts believe that samples returned to Earth will be invaluable for future scientific study, offering a lasting resource for generations of researchers.
