JWST in the laboratory (IMAGE) University of Queensland Caption In order to detect the most distant and oldest galaxies, the telescope needs to be huge and kept extremely cold. Credit NASA/Chris Gunn Usage Restrictions Free to share. Provide credit. 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.