PARIS — Efforts to create a global space traffic management system to avoid in-orbit collisions will fall short so long as the U.S. Defense Department is the principal provider of the raw data and China, India and Russia refuse to provide information on their satellites, industry experts said.

Like any military organization, the U.S. military wants to keep secret some of its assets, leaving them out of the data it provides to satellite operators.

That, plus the fact that the U.S. military is getting tired of . . .

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