galaxy [i g2lqksi ]     (순위: 6284 - 대학 수준)   복수  galaxies 뜻  은하계,성운 Mean  Any of numerous large-scale aggregates of stars, gas, and dust that constitute the universe, containing an average of 100 billion (10^11) solar masses and ranging in diameter from 1,500 to 300,000 light-years.