AT2018cow (IMAGE) W. M. Keck Observatory Caption An image of AT2018cow and its host galaxy obtained on August 17, 2018 using W. M. Keck Observatory's instrument, the DEep Imaging and Multi-Object Spectrograph (DEIMOS). Credit R. MARGUTTI/W. M. KECK OBSERVATORY Usage Restrictions None License Licensed content 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.