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A Radio Whisper From Nine Billion Years Ago Hands Astronomers a Cheap New Way to Weigh Dark Energy

The CHIME radio telescope in British Columbia has pulled a faint hydrogen signal out of 94 nights of old observations, light that left its source when the universe was about five billion years old. The team mapped the combined glow of hydrogen across large patches of sky rather than counting galaxies one by one. The method is far cheaper than galaxy surveys and offers an independent way to test explanations for dark energy.