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Comment Re:Why did they wait 5 months? (Score 1) 142

It is a very complex instrument. And a cosmic is not the first hypothesis in these case. It was very hard to find out the cause of the issue. And they could not risk switching to backup without knowing for sure it would not fail as the first one, and loose the instrument for good. It is not like you can go out there and repair it by trial and errors.

Numeric stability is probably not all that important when you're guessing.