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Then, we can find those same types of stars in other galaxies, and hence — if we know how stars work — we can measure the distances to those galaxies, too. Finally, we can measure that “standard candle” in those galaxies as well as others, and can extend our measurements of distance, apparent brightness, and redshift to galaxies that are as far away as we can see.... [+]
bands, and smaller temperature differences in the cosmic microwave background. The temperature imperfections help teach us what the Universe is made of and how it evolved, painting a picture that requires dark matter to make sense. By measuring the clustering of galaxies today and at a variety of distances, as well as by measuring the spectrum of temperature fluctuations and temperature-polarization fluctuations in the CMB, we can reconstruct how the Universe has expanded throughout its history.... [+]
BAO shown for contrast. It is plausible that the early signal method is correct and there's a fundamental flaw with the distance ladder; it's plausible that there's a small-scale error biasing the early signal method and the distance ladder is correct, or that both groups are right and some form of new physics is the culprit. But right now, we cannot be sure.
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Time for a recalibration
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