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总结
多家媒体称，天文学家通过Pan-STARRS巡天项目已发现一颗新彗星C/2025 R3（PanSTARRS），其轨道与亮度预报显示它将在2026年接近太阳与地球时可能显著增亮，被称为“2026年大彗星”候选。报道指出实际亮度仍取决于彗核活动、挥发物喷发及碎裂风险等不确定因素；若预报成立，未来数周至数月间在清晨或黄昏的天空中可能出现肉眼可见的观测窗口，成为2026年最受关注的天象之一。
正文
Astronomers may have already spotted the 'Great Comet of 2026' - and it could soon be visible to the naked eye Live Science Comet C/2025 R3 (PanSTARRS): We May Already Know When The Best Comet Of 2026 Is Coming IFLScience A New Celestial Visitor Just Entered Our Solar System - and It Could Be the 'Great Comet of 2026' Green Matters When and how to watch the 'great comet of 2026' NewsBytes 'Great Comet of 2026' spotted by astronomers - where and when to see 'brightest of the year' with naked eye in weeks The US Sun
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