One failure mode is static electricity build up leading to arc discharge and pitting the bearing races. Also, the vacuum tends to make the bearing grease evapo

One failure mode is static electricity build up leading to arc discharge and pitting the bearing races. Also, the vacuum tends to make the bearing grease evaporate. Back in the 60's they used spermaceti, maybe we should go back to that? https://est-aegis.info/2018/08/in-space-no-one-can-hear-your-bearings-fail/ https://est-aegis.info/2018/08/in-space-no-one-can-hear-your...