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Viking program
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===Power=== Power was provided by two [[radioisotope thermoelectric generator]] (RTG) units containing [[plutonium-238]] affixed to opposite sides of the lander base and covered by wind screens. Each Viking RTG<ref>{{cite web |title=SNAP-19 Radioisotope Thermoelectric Generator Fact Sheet by Energy Research & Development Administration (ERDA) Diagram 2 - The Energy Research and Development Administration |url=https://artsandculture.google.com/asset/_/twFyqw9QR3uOoQ |website=Google Arts & Culture |access-date=9 August 2022 |language=en}}</ref> was {{convert|28|cm|abbr=on}} tall, {{convert|58|cm|abbr=on}} in diameter, had a mass of {{convert|13.6|kg|abbr=on}} and provided 30 watts of continuous power at 4.4 volts. Four [[wet cell]] sealed nickel-cadmium 8 [[ampere hours|Ah]] (28,800 [[coulomb]]s), 28 volt [[rechargeable battery|rechargeable batteries]] were also on board to handle peak power loads.
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