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
![](https://www.keckobservatory.org/wp-content/uploads/2023/08/Screen-Shot-2019-08-26-at-8.16.50-AM-2.png)
JOHN O'MEARA
Chief Scientist
W.M. Keck Observatory