时速21万公里，外星探测器伪装成彗星将“攻击”地球？哈佛教授：运行轨道诡异，建议全球建立“宇宙防御系统”！中国专家：并无明显异常

Core Viewpoint - The article discusses the discovery of the interstellar object 3I/ATLAS, which has sparked debates regarding its nature, with some scientists suggesting it could be an alien probe disguised as a comet, while the mainstream scientific community views it as a comet [3][4][20]. Group 1: Discovery and Characteristics - 3I/ATLAS is the third confirmed interstellar visitor to enter the solar system, following 'Oumuamua' in 2017 and 'Borisov' in 2019 [3][4]. - Discovered on July 1, 2025, by the ATLAS telescope in Chile, it travels at an astonishing speed of 21 kilometers per second, equivalent to over 210,000 kilometers per hour [6][9]. - The object is estimated to have a diameter between 10 to 20 kilometers, with some estimates suggesting it could be as large as 40 kilometers [9]. Group 2: Anomalies and Theories - Avi Loeb, a Harvard professor, proposed six anomalies regarding 3I/ATLAS that challenge traditional comet models, suggesting it might be an alien spacecraft [11][12]. - The anomalies include its large size and brightness, lack of cometary gas features, unusual orbital characteristics, and its trajectory that allows it to be hidden behind the sun during its closest approach [12][14][15][16]. - Loeb's hypothesis has been met with skepticism from the scientific community, which largely supports the view that 3I/ATLAS is a comet, citing observed cometary activity [20][25]. Group 3: Scientific Community Response - Darryl Seligman, a leading researcher on 3I/ATLAS, emphasizes that the object exhibits classic comet characteristics, including a "fuzzy" appearance due to gas and dust release [20][23]. - Seligman argues that the initial size estimates of 3I/ATLAS were based on assumptions of inactivity, and ongoing observations may reveal more about its nature [23]. - Li Jianyang, a professor involved in planetary research, appreciates Loeb's bold hypothesis but disagrees, stating that current data does not support any significant anomalies [25][28]. Group 4: Future Implications - Loeb calls for a global investment in a "cosmic defense system" to prepare for future interstellar visitors, advocating for an AI-driven monitoring network [27]. - The article highlights the need for improved observational capabilities and advanced equipment in the study of interstellar objects, particularly in China [28].