Japanese satellite filled with 'shooting star' pellets won't spawn artificial meteor shower after all

Hate to say it but this sounds like an astonishing level of incompetence. To plan for a mechanical mechanism in space and not test it in vacuum first. Especially when it is central and critical to your mission. At a guess a vacuum test was omitted to save money..
As so often saving a few bucks now can cost you many times more later.. (Thinks of James Web telescope)
Jan 12, 2022
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I'm sure it was tested in vacuo at some level, but I doubt any zero-g flight would allow them to test shooting a pellet at 300 m/s! They are trying out something new here, and I'm sure will learn from this mistake.

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