This episode is a segment that we did in the Weekly Space Hangout talking about how astronomers are using masers (water lasers) to measure the expansion rate of the Universe.
You'd think that another, independent way to measure the expansion rate of the Universe would be helpful, but it's only deepened the mystery of the cosmological crisis.
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Thumbnail credit: ESO/M. Kornmesser
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References:
https://www.universetoday.com/146523/evidence-is-building-that-the-standard-model-of-the-expansion-of-the-universe-needs-some-new-ideas/
https://arxiv.org/pdf/2001.09213.pdf