Finding a Cosmic Fog (image) Yale University Share Print E-Mail Caption This image shows the gas temperature in the intergalactic medium (IGM), looking through the sheet in-between the two main halos. Red colors are hot gas, while blue colors are cold gas. Credit Yale University Usage Restrictions None Share Print E-Mail 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.