LIGO Ain’t a Gravitational Wave Detector—It’s an Observatory by Rhett Allain from on 2016-02-26 19:25 (#1591P) In order to use LIGO for astronomy, you need to know the location of the source of the gravitational waves. Here's how that works. The post LIGO Ain't a Gravitational Wave Detector-It's an Observatory appeared first on WIRED.