な阳系第三危"星际游客 正加魅靠远太阳 太阳系第三位"星际访客"31/ATLAS正加速靠近太阳。近 期,其轨道速度已达每秒约63.1公里,与太阳距离缩短至约4.2亿 公里。 CD 新华社国内部、新华社江苏分社联合制作 食"星际站" 何时还玩回点7 根据预测，3I/ATLAS在10月29日左右过近日点时，距 离太阳约2亿公里,位于火星轨道与地球轨道之间,届时它的 速度会达到每秒68公里左右。 1 新华社国内部、新华社江苏分社联合制作 太阳系第三位"星际访客"3I/ATLAS正加速靠近太阳。这颗7月初穿过木星轨道时被发现的系外天 体，自发现以来就持续吸引着全球天文学家和爱好者的目光。据最新观测，它将于10月29日前后经过近 日点，此后逐渐远离太阳系，最终重返太阳系外的星际空间。 中国科学院紫金山天文台科普主管王科超介绍，3I/ATLAS是目前已知造访太阳系的第三个星际天 体。被发现时，它距离太阳约6.7亿公里，位于木星轨道以内，当时的轨道速度约为每秒61.3公里。此 后，它不断加速向太阳靠近，近期的轨道速度已达每秒约63.1公里，与太阳距离缩短至约4.2亿公里。 "到10月29日左右过近日点时，它与太阳距离将缩小 ...

Core Points - Astronomers have confirmed that the interstellar object 3I/ATLAS has entered the solar system and is expected to pass near Mars later this year before exiting the solar system [1][4] - This is the third interstellar object discovered by humanity, following 1I/2017 U1 'Oumuamua' and 2I/Borisov [5] Group 1: Discovery and Characteristics - The object was first reported by the ATLAS telescope in Chile and has been officially named 3I/ATLAS and C/2025 N1 [1] - Initial estimates suggest that 3I/ATLAS has a diameter of approximately 20 kilometers, but this figure has significant uncertainty due to limited data [3] - The object shows signs of cometary activity, indicating it is losing mass, which is typical for comets as they approach the Sun [3] Group 2: Trajectory and Impact - 3I/ATLAS is traveling at a speed exceeding 60 kilometers per second and is currently about 4.5 astronomical units (AU) from the Sun [4] - It is expected to reach its closest point to the Sun at approximately 1.4 AU around October 30, 2023, and will not pose a threat to Earth, remaining over 240 million kilometers away [4] - The object is anticipated to make a close pass to Mars in early October, with a minimum distance of about 30 million kilometers [4] Group 3: Scientific Significance - The study of interstellar objects like 3I/ATLAS can provide insights into the formation of celestial bodies outside the solar system [5] - Researchers aim to measure various characteristics of these objects to compare them with nearby comets and asteroids, which is crucial for advancing planetary science [5]