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总结
多家海外媒体报道，天文学家在距离地球约1万光年的银河系区域探测到一颗罕见的“自由漂浮/流浪”系外行星，它不围绕任何恒星运行，像被放逐般独自穿行。研究团队称，这是首次对这类无主恒星行星同时测得质量与距离等关键参数，结果显示其质量接近土星。该发现为理解行星形成、被系统抛射后的演化及银河系内游离行星的数量提供了新的观测约束。
正文
Astronomers detect rare 'free floating' exoplanet 10,000 light-years from Earth Space Astronomers Measure The Mass of a Planet With No Star For The First Time ScienceAlert A planet as hefty as Saturn wanders the galaxy in exile Mashable Astronomers measure both mass and distance of a rogue planet for the first time Phys.org A Saturn-mass rogue planet spotted drifting alone through the galaxy Open Access Government
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