系外地球（ET）巡天任务任务是国家太空探源专项的四颗科学卫星之一，计划于2028年冬发射，目标是在日–地L2点部署一座专用空间天文台，系统性地搜寻系外类地行星。该任务将配备六台广角凌星望远镜和一台微引力透镜望远镜，并搭载大面阵CMOS探测器，以实现超高精度光度观测。在为期四年的主任务期间，ET将持续监测超过200万颗附近晚型矮星以搜寻凌星信号，同时在夏季集中观测银河系核球方向约3000万颗恒星以探测微引力透镜事件。模拟结果显示，ET有望首次探测到约17颗系外地球和约25颗流浪地球，并发现超过4000颗类地行星及数万颗其他类型的系外行星。本报告将重点介绍ET的任务设计、关键技术创新，以及其在推动类地行星探测与系外行星科学发展方面的重大潜在影响。

The Earth 2.0 (ET) Survey Mission is one of the four space missions in the China's Space Origins Exploration Program. It is scheduled for launch in the winter of 2028, with the goal of deploying a dedicated space observatory at the Sun–Earth L2 point to systematically search for Earth-like exoplanets. The mission will be equipped with six wide-field transit telescopes and one microlensing telescope, using large-format CMOS detectors to achieve ultra-high-precision photometric observations. During its four-year prime mission, ET will continuously monitor over two million nearby late-type dwarf stars to search for transit signals, while in the summer seasons it will observe about 30 million stars in the direction of the Galactic bulge to detect microlensing events. Simulation studies suggest that ET could, for the first time, discover about 17 Earth analogs and approximately 25 free-floating Earths, along with more than 4,000 terrestrial planets and tens of thousands of other types of exoplanets. This report will present the mission design, key technological innovations, and the significant potential impact of ET in advancing the search for Earth-like planets and the broader field of exoplanet science.

葛健教授现为中国科学院上海天文台长江学者讲席教授，国家创新人才，曾为佛罗里达大学终身教授(2004-2020),宾州州立大学助理教授(2000-2004)和利物浦国家实验室博士后(1998-2000)。于1989年获中国科大的理学学士, 1998年获亚利桑那大学天文学博士。葛健是系外地球（ET）巡天科学卫星任务首席科学家（2024-现在）、达摩近邻宜居行星巡天的创始人和首席科学家（2010-2020）、全球首位找到系外行星的华裔科学家、国际斯隆数字巡天三期MARVELS多目标地外行星巡天创始人和首席科学家(2006-2014)、美国航空航天局TESS空间探索项目合作伙伴和中国科技大学客座教授等。2018年入选《中国留学生的四十年》。中国空间科学学会空间科学大数据专业委员会的副主任（2025-现在）。他长期从事系外行星和观测宇宙学、天文技术和仪器以及人工智能在天文大数据应用的研究。迄今为止，他发表了157篇国际顶级期刊文章, 3篇国内期刊文章和121篇技术论文，同时拥有3个美国国家发明专利。

Dr. GEJian  is a chair professor at Shanghai Astronomical Observatory, Chinese Academy of Sciences. He was a professor at the University of Florida in 2004-2020, an assistant professor at Pennsylvania State University in 2000-2004, and a postdoc at Lawrence Livermore National Lab in 1998-2000. He received his PhD from the University of Arizona in 1998. He is the PI of the Earth 2.0 space mission in China. Dr. Ge’s team have made numerous discoveries of planets, brown dwarfs, binaries, asteroids, and various kinds of quasar absorbers. He has published 157 refereed journal papers, 121 technical papers, and was awarded with three US patents.