WASHINGTON — Contamination on a key sensor aboard the newest U.S. polar-orbiting weather satellite will degrade its performance and delay the spacecraft’s start of operations until early March, NASA said Jan. 19.

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Dan Leone is the NASA reporter for SpaceNews, where he also covers other civilian-run U.S. government space programs and a growing number of entrepreneurial space companies. He joined SpaceNews in 2011.Dan earned a bachelor's degree in public communications...