if three or more stars interact with each other, they form a multiple star system ,若有三颗或更多的星互相影响,我们则称之为多重星或聚星。
when compared with the multiple star systems, they consist of many more stars, from tens to millions 相对于多重星,星团内恒星的数目多很多,由数十以至数百万颗不等。
nature of the universe-chapter thirteen our sun is a single star with approximately constant brightness . in fact, in the universe, many stars are not alone, they interact with each other to form binary or multiple star systems 我们的太阳在太空中孤独地发放稳定的光芒,但在宇宙中,很多星星并不会单独地存在,而是和其它恒星组成双星或甚至多重星系统。