Laser light originating on the International Space Station has delivered a short video to the Earth’s surface, in a test of technology that may someday enable live video from the surface of Mars and other deep-space targets. Built at a cost of less than $20 million under a personnel-development program for young engineers at NASA’s Jet Propulsion Laboratory, the Optical Payload for Lasercomm Science (Opals) sent a high-definition video entitled “Hello World” from the ...


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