If you're in the space business long enough, you learn there are numerous ways a rocket can fail. I've written my share of stories about misbehaving rockets and the extensive investigations that usually—but not always—reveal what went wrong.

But I never expected to write this story. Maybe this was a failure of my own imagination. I'm used to writing about engine malfunctions, staging issues, guidance glitches, or structural failures. Last April, Ars reported on the bizarre failure of Firefly Aerospace's commercial Alpha rocket.

Japan's H3 rocket found a new way to fail last month, apparently eluding the imaginations of its own designers and engineers.

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