By the late 1970s, advances in telescope and detector technology made it feasible to carry out extensive redshift surveys of galaxies to create three-dimensional maps of the local cosmos.

• 到了1970年代末期，望远镜及探测科技的进展，使天文学家得以进行大规模的巡天计画，采集星系的红移以建立附近宇宙的三维图像。