LIGO mirrors (IMAGE) University College London Caption Technicians inspect the "First Contact" coating on one of LIGO's Input Test Masses (mirrors). https://www.ligo.caltech.edu/page/optics Credit Caltech/MIT/LIGO Lab Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.