Easier to just say it's NASA's high percentage confidence interval. Maybe it's the 95% mark. They are 95% certain it will last 5 years. They likely also have l

Easier to just say it's NASA's high percentage confidence interval. Maybe it's the 95% mark. They are 95% certain it will last 5 years. They likely also have lower confidence intervals with longer times. (If anyone knows what percentage the confidence interval actually is, I would be curious to know)