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A 10-billion-year-old stellar explosion, serendipitously recorded by the Hubble Space Telescope’s infrared camera, seems to show the cosmic expansion slowing down before it eventually sped up.
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Farthest supernova strengthens case for accelerating cosmic expansion
Phys. Today 54, 6, 17 (2001); http://dx.doi.org/10.1063/1.1387582