The 19-year-old Hubble Space Telescope is back to normal after an alarming hiccup earlier this week. A vital unit stopped communicating with the telescope's main computer on Monday, a development that sent the observatory into standby, or "safe", mode.
The device, which is needed to communicate with the telescope's science instruments, was installed in May during a mission to repair and upgrade the telescope in the hopes of extending Hubble's life until at least 2014.
The unit replaced the original, which was hobbled in September 2009. (Image: NASA)
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