"这始于人类的好奇心。太阳系中，除了地球上的智慧生命，是否还有其他星球上存在生命，这有 待探索。太阳系外，科学家也希望能够找到像地球这样的行星。"中国科学院国家空间科学中心主任王 赤院士说。 全国空间探测技术首席科学传播专家庞之浩认为，寻找"地球2.0"对人类生存、科学研究和文明发 展等方面意义重大。"寻到'地球2.0'，能为人类文明预留'备用家园'，有效应对人类正面临的资源枯 竭、全球变暖、小行星撞击等生存危机。"庞之浩说。 "同时，通过研究类地行星，可反观地球的过去与未来，助力破解地球演化谜题。"庞之浩说，寻 找"地球2.0"有望解答人类是否为宇宙孤例这一哲学之问，若发现地外生命，将彻底改写人类对宇宙和 自身的认知。 在11月24日召开的空间科学先导专项最新亮点成果发布会上，中国科学院国家空间科学中心公布 了"十五五"期间多项太空探源科学卫星计划。其中，旨在为人类寻找新家的系外地球巡天卫星，将巡视 星河，专门寻找和地球差不多大小、处在宜居带的第二颗地球，即"地球2.0"。 地球是孤独的吗？寻找"地球2.0"有什么意义？"地球2.0"需要符合怎样的标准？在寻找类地行星方 面，取得了哪些成果？针对以上问题，科 ...

Core Viewpoint - The Chinese Academy of Sciences announced plans for a space exploration satellite aimed at finding Earth-like exoplanets, referred to as "Earth 2.0," during the latest highlights release of the space science pilot project on November 24 [1] Group 1: Importance of Finding "Earth 2.0" - The search for "Earth 2.0" is driven by human curiosity about the existence of life beyond Earth and the potential for finding a backup home for humanity amid existential threats like resource depletion and climate change [2] - Discovering "Earth 2.0" could provide insights into Earth's past and future, and answer philosophical questions about humanity's uniqueness in the universe [2] Group 2: Criteria for "Earth 2.0" - "Earth 2.0" must meet strict criteria, including being a rocky planet with a radius between 0.8 to 1.25 times that of Earth, ensuring a solid surface and a stable atmosphere [3] - It should orbit a sun-like star within the habitable zone to maintain liquid water, with a suitable atmosphere to filter harmful radiation and support life [3] Group 3: Current Discoveries in Exoplanet Research - The Kepler Space Telescope has discovered over 6,000 exoplanets, but none have been found that are both Earth-sized and within the habitable zone [4] - Significant milestones in exoplanet discovery include the first confirmed exoplanets in 1992 and the identification of Kepler-186f as the first Earth-sized planet in the habitable zone in 2014 [5] - China's contributions to exoplanet research include the discovery of "super-Earth" Kepler-725c, which is about ten times the mass of Earth, showcasing advancements in astronomical detection techniques [5]

Core Insights - An international research team led by the Yunnan Astronomical Observatory of the Chinese Academy of Sciences has discovered a "super-Earth" named Kepler-725c located in the habitable zone of a sun-like star, with a mass approximately 10 times that of Earth [1][4] - This discovery marks the first time that the Transit Timing Variation (TTV) inversion technique has been used to identify such a planet in the habitable zone of a sun-like star [1][4] - The host star, Kepler-725, is a G9V type star, younger than the Sun at 1.6 billion years old, and exhibits more intense magnetic activity [1][4] Discovery Methodology - The planet Kepler-725c was not initially detected by the Kepler Space Telescope but was inferred through the observation of timing deviations in the transit of another planet within the Kepler-725 system [2][4] - The TTV inversion technique allows for the detection of "hidden" planets without needing to observe them directly, relying instead on the measurement of transit times of resonant planets [4] Future Implications - The new methodology and subsequent research outcomes will support future Chinese space astronomy missions, such as the Chinese Space Station Telescope (CSST) and the Earth 2.0 (ET) project, by providing new observational targets and detection techniques [5] - The research team plans to apply the TTV inversion technique to more exoplanet systems to search for "hidden" planets in the habitable zones of sun-like stars and red dwarf stars [5]