Mitsubishi Electric is building an orbital transfer vehicle under Japan's Space Strategy Fund. We map the race: America's speed-and-price game led by Impulse Space, China's dual-use Shijian maneuvers, and Japan's unconventional bet on the docking skills it honed resupplying the ISS.
Japan's H3 Rocket No. 6 was postponed over poor weather. The booster-less test flight carries six small satellites: deorbit sails, a 1 km space tether, a day-and-night telescope, and a French sat that hunts ships gone dark. Here is what each one does.
