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On Saturday 27 January 2007 at 13:34 CET the NASA/ESA Hubble Space Telescope entered into a protective "safemode" condition, most likely triggered by a short circuit in Hubble’s main instrument the Advanced Camera for Surveys (ACS). ACS had been running since June 2006 on its secondary backup electrical system.
Hubble was recovered from safemode around 2 a.m. EST on Jan. 28, and science observations will resume this week using the remaining Hubble instruments: Wide Field Planetary Camera 2, Near Infrared Camera Multi-Object Spectrograph, and the Fine Guidance Sensors.
The ACS (pdf) can survey a field on the
sky twice as large as the original Hubble Deep Field, to
the same exposure depth, three to four times faster than
the camera that took the original Hubble Deep Field