[[1]] are used as a source of power in satellites.

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answer is SOLAR CELLS.

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Detailed Solution

Solar cells are used as a source of power in satellites.
“A solar panel is a collection of solar cells that generate electricity directly from the sun's light”. As long as a satellite gets enough sunlight, it will continue to generate enough electricity to power its onboard systems, removing the need to replenish batteries, which are difficult to perform once the satellite is launched.

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