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Dust Ruins Another Way of Measuring Distance in the Universe

Astronomers are always searching for new ways to measure distance in the Universe, especially at the greatest distances where less is known. One method measures active galaxies blasting out ultraviolet and X-ray radiation. Another measure is X-ray radiation coming from the accretion disk around a quasar. Since both methods measure the same distance to a galaxy, they should match. But they don't, and the culprit, once again, is dust absorbing and scattering UV and X-rays.

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