Scientific American 202609 Spying on the Universe Summary
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NASA’s Nancy Grace Roman Space Telescope began as an instrument meant to look down at Earth, not out into the universe. Its 2.4-meter mirror was built for a U.S. surveillance program that collapsed after severe delays and cost overruns. The National Reconnaissance Office no longer needed the hardware, but NASA did. That unlikely transfer gave astronomy a Hubble-class telescope whose unusually wide view could transform the study of dark energy, dark matter and planets beyond the solar system.
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