성단(星団)이라는 측정자

과학동아 1988년 05호

would always have the same total brightness. William Harris, an astronomer at McMaster University in Hamillton, Canada, has recently made a careful study of the globular clusters in nearby galaxies whose distance is known. He determined the apparent brightness of the globular clusters and from their distance he could calculate how luminous they really are in comparison to our sun, for ...