The telescope's payload computer suddenly stopped working on June 13, sending NASA engineers scrambling to figure out the problem. That computer, built in the 1980s, is like Hubble's brain — it controls and monitors all the science instruments on the spacecraft. So the telescope has gone into a hibernation-like "safe mode" while NASA troubleshoots.
The agency has made three attempts to get Hubble's computer working again — in vain. If NASA can't fix the issue, the telescope should be able to switch to hardware on its backup payload computer, but that hasn't powered up since astronauts installed it in 2009. It would take NASA several days to bring the telescope back to its full science operations following such a switch.
Zkoušejí restart nebo nahodit záložní, ale zatím no akosi...https://www.businessinsider.com/nasa-troubleshooting-hubble-space-telescope-computer-error-2021-6