The Sloan Digital Sky Survey: PI ON THE SKY

摘要

When the originators of the Sloan Digital Sky Survey (SDSS) met at O'Hare International airport in the fall of 1988, their intent was to form a collaboration that would measure the size of the largest structures of galaxies in the Universe. Previous galaxy surveys had shown that the largest structures were at least 400 million light years in extent- as large as the largest structures that could have been found by these surveys. In particular, the results of the CfA Redshift Survey were astounding. From the spectra of one thousand galaxies, the researchers were able to depict a slice of our Universe with large "voids" (where the galaxy density was very low) surrounded by dense "walls" of galaxies.