The Hubble Telescope came to life after a grueling month of darkness. Here’s what went wrong.

NASA’s Hubble Space Telescope is back to work with all of its scientific instruments fully operational after more than a month orbiting Earth in “safe mode,” NASA said, according to NASA.

On Saturday (July 17), engineers revived the satellite, launched in 1990 and built using equipment from the 1980s, after identifying a possible malfunction in the Hubble Telescope’s power control unit, which “provides a stable supply of voltage to the payload computer hardware.” according to NASA.

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