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Episode 66: A Bigger Universe?

Play Nov 9•4:25

The expansion rate and scale of the universe are fundamental quantities that astronomers strive to nail down. As of 2001, the expansion rate of the universe, and therefore the distance scale, was pretty well determined. New observations of a binary star system in a nearby galaxy, M33, has highlighted the difficulty of measuring vast distances. The stars' dimness indicates that the system is 15...

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