The U.S. Air Force’s current-generation missile warning satellites each carry two main infrared sensors, but a new study by prime contractor Lockheed Martin concludes that a new version carrying a single sensor could offer nearly the same performance.

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Mike Gruss is the chief content and strategy officer at SpaceNews. From 2013 to 2016 he was a senior reporter at SpaceNews covering military space. Previously, he was editor in chief of Sightline Media Group and worked as a reporter and columnist for...