CIRCLE WITH A DOT

@brouhaha @nyrath The latter is usually the case for things headed to space, especially if you can't practically switch over to a redundant spare. Since you went to all the money and effort to put it in space, you want to make sure it works for the intended mission life with high confidence, so you add a fair bit of margin, which means it has a good chance to last quite a bit longer than the intended mission life. But, as @Ann_Effes points out, there are costs to doing that, so you try not to go too overboard. @pomarede