4 ms·It's not that they don't work in vacuum, it's that they don't work after a decade in extremely cold vacuum.by seanflyon 12y agoIt's not that they don't work in vacuum, it's that they don't work after a decade in extremely cold vacuum.eps 12y ago... unlike a not-so-harsh room-temperature vacuum ;)seanflyon 12y agoOK, after a decade extremely cold and in a vacuum.