Overview
- The MMX spacecraft lifted off from Tanegashima this week and is now on an interplanetary cruise toward Mars, with arrival and Phobos operations planned for 2027.
- Mission plans call for a small European rover to be deployed on Phobos, followed by surface sampling using a pressurized-gas scoop for loose dust and a coring tool to take roughly 2 cm deep samples.
- MMX carries 13 instruments supplied by Japan, NASA and European partners, including NASA’s MEGANE gamma-ray and neutron spectrometer, to map composition and scout landing sites.
- Engineers face major technical risks because Phobos’s weak gravity and uncertain regolith require novel landing and touch-down tactics that build on JAXA’s Hayabusa sample-return experience.
- The mission tests Japan’s H3 launcher reliability, relies on Australian recovery and international curation, and could return a small fraction of Martian ejecta that may preserve sedimentary clues to past habitability.