How do astronomers create three-dimensional maps of the universe?

Question

Quizplus · Accepted Answer

Astronomers create three-dimensional maps of the universe by using a galaxy's position on the sky and its redshift to determine its distance along the line of sight. This is known as redshift space distortion and it allows astronomers to map out large-scale structures of the universe. A computer model may be used to help interpret the data, but the observations themselves provide the basis for the map.

How Do Astronomers Create Three-Dimensional Maps of the Universe