TOKYO — The launch of Japan’s new workhorse H3 rocket has been postponed again as engineers continue to wrestle with engine problems first uncovered in 2020 during qualification testing.

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Brian Berger is editor in chief of SpaceNews.com and the SpaceNews magazine. He joined SpaceNews.com in 1998, spending his first decade with the publication covering NASA. His reporting on the 2003 Space Shuttle Columbia accident was recognized with...