France and Germany are set to send the Idefix rover as part of Japan's MMX mission, which aims to explore Phobos, the largest of Mars's two moons. The rover, weighing less than 25 kilograms and measuring 45 x 40 x 35 centimeters, will be deployed from the MMX probe at an altitude of 40 to 100 meters during one of the probe's closest approaches to Phobos. The descent, lasting 60 to 80 seconds, will be carefully controlled to ensure the rover lands at a speed of less than one meter per second. This slow landing is crucial because Phobos has an extremely weak gravitational pull—about a thousandth of Earth's—which means even a small jolt could cause the rover to escape into space. To ensure a stable landing, Idefix is equipped with blade wheels designed to provide traction without creating sudden movements that might push it upward. Once on the surface, the rover will use four small solar panels, each capable of generating up to 15 watts of power, to operate independently. Communication with Earth will be handled through the MMX probe, which remains in orbit around Phobos. However, the rover's time on the surface is expected to be limited to about 100 days, as the MMX probe will gradually move away from Phobos to continue its broader scientific objectives. The MMX mission seeks to answer a key question in planetary science: whether Phobos is an asteroid that was captured by Mars's gravity or a fragment from a massive ancient impact on the planet. Data collected by Idefix, along with samples returned by the MMX probe, could provide critical insights into this long-standing debate. The mission is a major international effort involving France, Germany, and Japan, with each country contributing specialized technology and expertise to achieve the mission's goals. This collaboration highlights the growing trend of international space exploration partnerships, where countries pool resources and knowledge to tackle complex scientific challenges. The MMX mission not only advances our understanding of Phobos but also contributes to broader studies of the Martian system and the origins of celestial bodies in the solar system.