In Search of the Ultimate Ruler: The Grand Challenge of Distances in Astronomy

Even with the most powerful telescopes and instrumentation, astronomy faces a fundamental problem: the ability to determine the distance to objects in the cosmos. From the solar system to the cosmic microwave background, the history of astronomy is intertwined with the hunt for a better distance measure.  This talk will trace that history and that quest, from the era before telescopes to the telescopes of tomorrow.

Guest Speaker

JOHN O'MEARA

Chief Scientist
W.M. Keck Observatory

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