I heard a few bits and pieces about detecting gravitational waves. And the engineering is phenomenal. Gravity waves are measured by movement of suspended test masses, which are 40kg blocks of silica polished to have mirror ends so they can be sensed by laser (I have no idea how laser sensing works when gravity is ...
from ElectronicsWeekly http://www.electronicsweekly.com/blogs/engineer-in-wonderland/ligo-is-amazing-2016-06/
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