Herschel's Test View of M51 (IMAGE) European Space Agency Caption Red, green and blue correspond to the 160-micron, 100-micron and 70-micron wavelength bands of the Herschel’s Photoconductor Array Camera and Spectrometer, PACS. Glowing light from clouds of dust and gas around and between the stars is visible clearly. These clouds are a reservoir of raw material for ongoing star formation in this galaxy. Blue indicates regions of warm dust that is heated by young stars, while the colder dust shows up in red. Credit ESA and the PACS Consortium Usage Restrictions Only with the credit line provided. 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.