early-type galaxy

例句：

1. 1.These early-type galaxies are believed to be the first signs of life on other planets.
   这些早期型星系被认为是其他星球上生命存在的最初迹象。
2. 2.The discovery of these early-type galaxies has sparked a new era in cosmology.
   这些早期型星系的发现开启了宇宙学的新纪元。
3. 3.Early-type galaxies are known for their high concentrations of star formation and rich environments for life.
   早期型星系以其高浓度的恒星形成和丰富的生命环境而闻名。