PARIS — European government officials planning their own space traffic monitoring and space debris mitigation programs debated the value of crafting new best-practice guidelines without the participation of the three nations that account for well over 90% of all space debris: China, Russia and the United States.

They also raised the question of whether introducing stricter debris-mitigation guidelines makes any sense given the high proportion of satellite operators that do not respect even today’s recommended practices.

“There are 14,457 space objects catalogued by the U . . .

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