Other evidence of dark energy and dark matter continues to be contested, but their fingerprints in the cosmic microwave background (CMB) are hard to explain away. Their signal is evident in the sizes of the blobs that can be detected in that data. Here's the story of how researchers learned to interpret it, and why that evidence remains so compelling. https://www.quantamagazine.org/how-the-cosmic-microwave-background-reveals-the-universes-contents-20200128/ | Quanta Magazine