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HST didn't get extra panels; the original arrays were replaced during HST Servicing Mission 2 in 1997, due to extreme warping of the arrays caused by thermal changes in space as HST moved through the Earth's terminator (the point in orbit where night becomes day, and day becomes night) every 97 minutes.

The replacement arrays were themselves replaced on one of the last 2 servicing missions, to ensure power for as long as possible until HST is brought down in the next few years.

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Q: Why did the Hubble Telescope need an extra solar panel?
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