WASHINGTON — The Defense Innovation Unit is seeking commercial proposals to beam electrical power between spacecraft and from orbit to the ground in a demonstration within two years, an effort to move a long-studied technology toward operational military use by the end of the decade.

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Sandra Erwin writes about military space programs, policy, technology and the industry that supports this sector. She has covered the military, the Pentagon, Congress and the defense industry for nearly two decades as editor of NDIA’s National Defense...