一颗星际彗星,即3I/ATLAS,以不寻常的活动和结构违抗人们的期望,促使人们重新评估彗星模型。 An interstellar comet, 3I/ATLAS, defies expectations with unusual activity and structure, prompting a reevaluation of comet models.

2025年7月发现的3I/ATLAS号星际天体在倒退路径上以每秒60多公里的速度从太阳飞走,于2026年3月接近木星时,继续使天文学家惊异不已。 Interstellar object 3I/ATLAS, discovered in July 2025, continues to astonish astronomers as it speeds away from the Sun at over 60 km/s on a retrograde path, approaching Jupiter in March 2026. 与典型彗星不同，它表现出稳定、有组织的气体喷射，具有持续且不平衡的昏迷状态和稳定的向日射流，同时具有由大颗粒尘埃组成的特殊反尾。 Unlike typical comets, it exhibits steady, organized outgassing with a persistent, lopsided coma and a stable sunward jet, along with an unusual anti-tail made of large dust grains. 美国航天局的Parker Solar Probe和其他观测站提供的数据揭示了水冰、CO2、氢氧基和非重力,表明内部结构或旋转结构复杂。 Data from NASA’s Parker Solar Probe and other observatories reveal water ice, CO2, hydroxyl, and non-gravitational forces, suggesting complex internal structure or rotation. 它的亮度和活动即使在6.4 AU也保持强,表明它有一个大核和原始,可能是独特的组成. Its brightness and activity remain strong even at 6.4 AU, indicating a large nucleus and pristine, possibly unique composition. 科学家们正在重新评估彗星模型,未来的任务,如欧空局的彗星拦截器,预期会探索这些物体。 Scientists are reevaluating comet models, with future missions like ESA’s Comet Interceptor expected to explore such objects.