WASHINGTON — NASA should contribute $20 million worth of hardware to Europe’s planned Euclid dark-energy observatory, but only “in the context of a strong U.S. commitment” to the proposed Wide-field Infrared Survey Telescope (WFIRST), a panel of astrophysicists said.

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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...