Core Viewpoint - A significant breakthrough has been achieved by a Chinese research team in the search for habitable exoplanets, discovering a "super-Earth" named Kepler-725c, which is approximately 10 times the mass of Earth, located in the habitable zone of a G9V-type star [1][3]. Group 1: Discovery and Methodology - The research team, led by the Yunnan Observatory of the Chinese Academy of Sciences, utilized Transit Timing Variation (TTV) technology to identify Kepler-725c, marking the first time this method has been applied in the habitable zone of a sun-like star [1][3]. - Kepler-725c orbits its host star, Kepler-725, in about 207.5 days, a period similar to Earth's orbital cycle [2]. - The TTV method allows for the detection of planets without needing to observe them directly, relying instead on the timing variations of another planet's transit to infer the presence of the hidden planet [3]. Group 2: Implications and Future Research - This discovery opens new avenues for finding Earth-like planets in habitable zones around sun-like stars, potentially leading to the identification of "Earth 2.0" [3]. - The research will support future Chinese space astronomy missions, such as the manned space program and the Earth 2.0 project, by providing new observational targets and techniques [3]. - The team plans to apply TTV technology to more exoplanet systems to uncover additional hidden planets in both sun-like and red dwarf star habitable zones [3].

来源：中国新闻网 利用TTV反演技术发现的"隐藏"在类太阳恒星宜居带内的行星Kepler-725c。中国科学院云南天文台 供 图 该项目研究团队使用的TTV反演技术，不需要看见待发现行星遮挡宿主恒星的过程，也不需要宿主恒星 在视线方向发生轻微摆动，只需测量与待发现行星轨道共振的另一颗行星的凌星时间，就能间接感知待 发现行星的存在。这使得TTV反演技术成为发现类太阳恒星宜居带中"隐形行星"的有力工具。这项发现 标志着中国科研团队在寻找第二个地球("地球2.0")的征途上迈出关键一步。 该项目建立的新通道和后续相关研究结果将为中国未来的空间天文任务，比如中国载人航天工程巡天空 间望远镜(CSST)、地球2.0(ET)项目等，提供新的观测目标和探测技术支持。中国科学院云南天文台的 相关研究团组计划将TTV反演技术应用于更多系外行星系统，从而寻找"隐藏"在类太阳恒星和红矮星宜 居带中的系外行星。(完) 此次发现的行星围绕一颗名为Kepler-725的G9V型宿主恒星运行。该宿主恒星的光谱型与太阳相似，但 比太阳年轻，年龄仅为16亿年，其表面磁场活动比太阳活动更为剧烈。该行星位于Kepler-725的宜居带 ——一个适 ...