Subject: universal expansion
https://phys.org/news/2024-08-...

But new measurements from the powerful James Webb Space Telescope seem to suggest that there may not be a conflict, also known as the "Hubble tension," after all.

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One major approach involves studying the remnant light from the aftermath of the Big Bang, known as the cosmic microwave background. The current best estimate of the Hubble constant with this method, which is very precise, is 67.4 kilometers per second per megaparsec

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In the past, measurements with this method [measure the expansion of galaxies in our local cosmic neighborhood directly, using stars whose brightnesses are known] returned a higher number for the Hubble constant—closer to 74 kilometers per second per megaparsec.

This difference is large enough that some scientists speculate that something significant might be missing from our standard model of the universe's evolution.