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Viking program
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===Power=== The power to the two orbiter craft was provided by eight {{cvt|1.57|×|1.23|m|in}} [[solar panels]], two on each wing. The solar panels comprised a total of 34,800 solar cells and produced 620 W of power at Mars. Power was also stored in two [[nickel-cadmium]] 30-[[ampere hour|A·h]] [[battery (electricity)|batteries]]. The combined area of the four panels was {{convert|15|m2|ft2|abbr=off|sp=us}}, and they provided both regulated and unregulated direct current power; unregulated power was provided to the radio transmitter and the lander. Two 30-amp·hour, nickel-cadmium, rechargeable batteries provided power when the spacecraft was not facing the Sun, during launch, while performing correction maneuvers and also during Mars occultation.<ref name="jpl-factsheet-viking">{{Cite web |title=Viking Fact Sheet |url=https://www.jpl.nasa.gov/news/fact_sheets/viking.pdf |url-status=dead |archive-url=https://web.archive.org/web/20120310184911/https://www.jpl.nasa.gov/news/fact_sheets/viking.pdf |archive-date=March 10, 2012 |access-date=March 27, 2012 |publisher=[[Jet Propulsion Laboratory]] }}</ref>
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