PARIS — Three months after receiving U.S. FCC approval, which triggered a regulatory countdown, SpaceX’s Starlink satellite broadband constellation remains as much of a black box as ever.

There has been no verifiable major development that would indicate the passage of milestones needed for a constellation of 4,425 400-kilogram satellites costing billions of dollars to field, beyond the February launch of two small proof-of-concept satellites.

Unlike other broadband constellation sponsors, some of which are no further along than SpaceX in funding or technology development . . .

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