How NASA saved Hubble's most vital camera after a sudden electronic failure

Space · Published 7 October 2026 Swipe more like this →

In short: In January 2007, a sudden electronics failure silenced the Advanced Camera for Surveys, Hubble's most used instrument. This crisis threatened the telescope's ability to survey the sky with its signature efficiency, forcing engineers into a high-stakes race to develop a repair strategy that astronauts could execute in orbit.

The Advanced Camera for Surveys (ACS) was installed during Servicing Mission 3B in 2002. Engineers created it to scan vast celestial regions ten times more effectively than the former top-tier camera, the Wide Field Planetary Camera 2 (WFPC2). The ACS met this goal for five years, evolving into the most frequently utilised tool on the observatory. This instrument was designed to operate across various wavelengths. It significantly improved upon the capabilities of the previous premier Hubble camera.

The crisis arrived in January 2007, when an electronics failure rendered the two most-used science channels inoperable. This included the High Resolution Channel (HRC), which ultimately could not be repaired. However, the Wide Field Channel (WFC)—responsible for 70 percent of the ACS science prior to the failure—was successfully repaired by astronauts during Servicing Mission 4. The repair was carried out during a specific servicing mission. This mission was essential for restoring the instrument's primary scientific functions.

The engineering feat required Goddard engineers to develop new circuit board components and specialized tools in an incredibly short timeframe. This complex recovery was made possible because engineers could leverage techniques previously developed to repair the Space Telescope Imaging Spectrograph (STIS). Goddard engineers had to design a strategy that astronauts could perform. They also had to manufacture new tools and components under extreme pressure.

While the telescope faces modern challenges, such as atmospheric drag causing it to drift toward Earth, NASA officials suggest the observatory remains incredibly productive. While private proposals have been discussed to reboost the telescope into a higher orbit, NASA currently expects to continue producing groundbreaking science through the end of this decade and into the next. The telescope has been orbiting the planet since 1990. Currently, officials believe the observatory will remain productive for many years.

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