(IMAGE) National Institutes of Natural Sciences Caption The number density of DOGs that were newly selected in this study, as a function of infrared luminosity. Data represented by the red star is the HSC result. The research team found that (i) their infrared luminosity exceeds 10 trillion suns, and (ii) their number density is about 300 per cubic gigaparsecs. Credit Ehime University/NAOJ/NASA/ESO 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.