Study of an under-appreciated subclass of stars that brighten and dim periodically brings to light their potential use as cosmic yardsticks — out to distances of a few hundred million light years.
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Lahav, O. Climbing up the cosmic ladder. Nature 459, 650–651 (2009). https://doi.org/10.1038/459650a
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DOI: https://doi.org/10.1038/459650a