PolyU (IMAGE) The Hong Kong Polytechnic University Caption PolyU mobilizes multi-disciplinary resources to support Chang'e-4 mission. Credit The Hong Kong Polytechnic University 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.