The biggest clash in cosmology might be inching closer to resolution, thanks to the James Webb Space Telescope.
Scientists disagree over the universe’s expansion rate, known as the Hubble constant. There are two main methods for measuring it — one based on exploding stars called supernovas and the other on the universe’s oldest light, the cosmic microwave background. The two techniques have been in conflict for a decade, in what’s known as the “Hubble tension” (SN: 3/21/14). If this tension is real, and not the result of an error in one of the measurements, it would demand a drastic shift in how scientists understand the universe.
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