From October 2007 until mid-2022, the Atacama Cosmology Telescope (ACT) looked at the millimeter and microwave universe. It discovered the most extreme galaxy cluster and many other peculiar things, though its true focus has always been studying the cosmic microwave background (CMB). The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

This is the light echo of the Big Bang, the first light that freely moved through the universe. This relic is crucial to our understanding of the universe, and now the ACT team has published the final data release, confirming that there is something very wrong with our understanding of the universe.

The crux of it all is the Hubble Constant, a very important parameter that expresses the expansion rate of th

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