PARIS —  NewSpace companies are bringing innovative business models and technology applications to the space industry but are still too often sorcerer’s apprentices when it comes to conduct in space, according to a venture-capital investor, an insurer and a space-debris tracker.

Too many satellites are left in low Earth orbit at the end of their service lives, with no attempt being made to push them to lower altitudes to accelerate atmospheric reentry.

So many investors are jumping into the industry with zero understanding of its risks and . . .

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