Fast radio bursts (FRBs) are brief, bright, extragalactic radio flashes^1,2. Their physical origin remains unknown, but dozens of possible models have been postulated³. Some FRB sources exhibit repeat bursts^4,5,6,7. Although over a hundred FRB sources have been discovered⁸, only four have been localized and associated with a host galaxy^9,10,11,12, and just one of these four is known to emit repeating FRBs⁹. The properties of the host galaxies, and the local environments of FRBs, could provide important clues about their physical origins. The first known repeating FRB, however, was localized to a low-metallicity, irregular dwarf galaxy, and the apparently non-repeating sources were localized to higher-metallicity, massive elliptical or star-forming galaxies, suggesting that perhaps the repeating and apparently non-repeating sources could have distinct physical origins. Here we report the precise localization of a second repeating FRB source⁶, FRB 180916.J0158+65, to a star-forming region in a nearby (redshift 0.0337 ± 0.0002) massive spiral galaxy, whose properties and proximity distinguish it from all known hosts. The lack of both a comparably luminous persistent radio counterpart and a high Faraday rotation measure⁶ further distinguish the local environment of FRB 180916.J0158+65 from that of the single previously localized repeating FRB source, FRB 121102. This suggests that repeating FRBs may have a wide range of luminosities, and originate from diverse host galaxies and local environments.

快速射电暴 (FRB) 是短暂、明亮的河外射电闪光^1,2。它们的物理起源仍然未知，但已经假设了数十种可能的模型³。一些 FRB 源表现出重复爆发^4,5,6,7。尽管已经发现了一百多个 FRB 源⁸，但只有四个已被定位并与宿主星系^9,10,11,12相关联，而这四个中只有一个已知会发射重复的 FRB ⁹. 宿主星系的特性以及 FRB 的局部环境可以提供有关其物理起源的重要线索。然而，第一个已知的重复快速射电暴位于一个低金属度、不规则矮星系，而明显非重复的源定位于更高金属度、大质量椭圆或恒星形成星系，这表明可能是重复且明显非- 重复来源可能有不同的物理起源。在这里，我们报告了第二个重复 FRB 源^{6的精确定位}，FRB 180916.J0158+65，位于附近（红移 0.0337 ± 0.0002）大质量螺旋星系的恒星形成区域，其性质和接近度使其与所有已知宿主区分开来。缺乏相对发光的持久无线电对应物和高法拉第旋转测量⁶进一步区分了 FRB 180916.J0158+65 的局部环境与先前定位的单个重复 FRB 源 FRB 121102 的局部环境。这表明重复 FRB 可能具有范围广泛的光度，来自不同的宿主星系和当地环境。