helio writes "The Hubble's Advanced Camera for Surveys (ACS) went offline on June 19, 2006. The cause is yet undetermined, although engineers suspect that the culprit may be a bad transistor in the ACS's electronic control board or possibly a memory corruption event due to energetic particle bombardment. Since a backup electronic controller is available for service, this incident is not very likely to lead to the end of the Hubble's Advanced Camera in any event. But, before any attempt to reactivate the camera, engineers are cautiously evaluating and isolating the probable cause of this incident in order to avoid any further incident."
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