Juno's solar panels being tested. Juno was never designed to travel in darkness. Its solar panels are its source of power, and it doesn't have enough battery storage capacity to survive 12 hours of darkness. Image Credit: By Photo credit: NASA/Jack Pfaller - http://mediaarchive.ksc.nasa.gov/detail.cfm?mediaid=53133, Public Domain, https://commons.wikimedia.org/w/index.php?curid=15418531
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