NASA switches Hubble to backup hardware in last-ditch effort to get it back online TechSpot

Last month, on June 13, the HST's main payload computer went down, and NASA engineers could not get it to reboot past safe mode. Technicians thought the problem might have something to do with the 31-year-old orbiting telescope's memory module. However, it turned out to be the power control unit (PCU).





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