For years, cosmologists have been struggling with the "Hubble tension," a disagreement between measurements of the present-day expansion rate of the universe. One promising solution to this predicament is the loss of mass as black holes merge. However, new research suggests this is unlikely to work, so the mystery remains.

In 2022, astronomers began to notice something strange with measurements of the Hubble constant, the unit of measurement used to describe the expansion rate of the universe. Values of the constant derived from observations of the early universe, like the cosmic microwave background, were significantly lower than measurements taken in the nearby, modern-day universe.

As the years have gone by, this discrepancy has only deepened, and cosmologists have been searching in v

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