HST Yellow supergiants in nearby galaxies

After the main sequence phase, stars more massive than 2.5M_{sun} rapidly evolve through the Hertzsprung gap as yellow giants and supergiants (YSG), before settling into the red...在经历主序星阶段（Main Sequence Phase）后，质量大于2.5倍太阳质量（Solar Mass）的恒星会以黄巨星与超巨星（Yellow Giants and Supergiants，YSG）的身份快速穿越赫茨普龙间隙（Hertzsprung gap），随后稳定进入红[原文内容未完整呈现]阶段。