星系可以小到什么程度？星团见了都得喊声“弟弟”！【宇宙杂谈】
“多少粒沙才算一个沙堆”这个问题可以从很多角度来回答，但“多少颗恒星才算一个星系”，这个问题的思考角度将完全不一样。
[1] Simon E. T. Smith, William Cerny et al. The Discovery of the Faintest Known Milky Way Satellite Using UNIONS. The Astrophysical Journal. 961(1). 92. (2024)
[2] Raphaël Errani, Julio F. Navarro et al. Ursa Major III/UNIONS 1: The Darkest Galaxy Ever Discovered?. The Astrophysical Journal. 965(1). 20. (2024)
[3] Scot Devlin , Holger Baumgardt , Sarah M Sweet. Reevaluating UMa3/U1: star cluster or the smallest known galaxy?. Monthly Notices of the Royal Astronomical Society, Volume 539, Issue 3, May 2025, Pages 2485–2497
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