The Sodium Guidestar at the Air Force Research Laboratory's Starfire Optical Range resides on a 6,240 foot hilltop at Kirtland Air Force Base, It is theorized that arrays of such ground-based lasers could one day propel spacecraft by focusing their beam of photons on a sail attached to the vessel. ( Army) 160225-D-UB488-001 by AirmanMagazine

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