Fig. 1. System of mission objectives. (IMAGE) Beijing Institute of Technology Press Co., Ltd Caption Fig. 1. System of mission objectives. Credit Space: Science & Technology Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only 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.