Japan Launches $578M Phobos Sample-Return Mission

Japan sent off the first dedicated spacecraft Monday to retrieve samples from Phobos, Mars’s largest moon, in a daring bid that will span five years and cost $578 million. The MMX craft rode an upgraded H3 rocket from Japan’s Tanegashima Space Center. This enhanced version of Japan’s flagship launcher featured four solid rocket boosters and a larger payload shroud, features specifically engineered to handle the mission’s demanding requirements.

After separating from the rocket 71 minutes into flight, the 4.5-metric-ton spacecraft—with two-thirds of its mass dedicated to propellant—reached sufficient velocity to escape Earth’s gravity and begin its ten-month cruise to Mars. Controllers confirmed successful separation and solar panel deployment moments after burnout. Scientists believe Phobos may be an asteroid that Mars captured long ago; the mission will test this hypothesis and potentially unlock clues about Solar System formation.

The effort extends Japan’s proven track record in sample-return spaceflight, building on the earlier Hayabusa and Hayabusa 2 asteroid missions. That expertise positions Japan to make a significant contribution to planetary science while advancing its own space exploration capabilities.