【参考消息：#NASA称与一火星轨道探测器失联#】参考消息援引德新社12月20日报道，美国航空航天 局（NASA）已与火星轨道探测器MAVEN失去联系。NASA发言人告诉德新社，目前正在努力恢复联 系。报道称，大约两周以来，没有收到任何来自MAVEN的常规数据。NASA此前曾表示，本月早些时 候的一段"短暂的跟踪数据"表明，该探测器可能正在"以一种意想不到的方式旋转"。MAVEN于2013年 底发射，已绕火星运行约10年，提供了重要的研究数据，尤其是在火星大气层方面。（参考消息） ...

Core Insights - The article discusses the recent observations of the interstellar comet 3I/ATLAS, which has sparked curiosity and speculation since its entry into the solar system this summer, traveling at a speed exceeding 240,000 kilometers per hour [2][3] Group 1: Observations and Findings - NASA has released images from multiple spacecraft, confirming that 3I/ATLAS is a typical comet driven by ordinary physical mechanisms, dismissing theories of it being an alien spacecraft [2] - The closest images were captured by the Mars Reconnaissance Orbiter (MRO), showing a blurry white ball composed of dust and ice, with the comet's activity increasing as it approaches the Sun [3] - Data from the James Webb Space Telescope and SPHEREx provided insights into the comet's composition, revealing a significant amount of carbon dioxide and water ice near its nucleus [3] Group 2: Anomalies and Characteristics - Observations indicated unusual phenomena, such as a rapid brightening of the comet as it neared the Sun and the detection of nickel vapor, which is atypical for low-temperature environments [4] - The comet's behavior was reconstructed in three-dimensional space using data from various spacecraft, enhancing the understanding of its characteristics [4] Group 3: Size and Origin - Despite accumulating observations, the exact size of 3I/ATLAS remains uncertain, estimated to be between several hundred meters to a few kilometers in diameter, with its shape obscured by dust [5] - The origin of 3I/ATLAS is challenging to determine, with possibilities suggesting it has been drifting in interstellar space for a long time or may originate from an older stellar system [5] - The comet is expected to come closest to Earth on December 19, at approximately 270 million kilometers away, before it begins to exit the solar system [5]