The Sloan Digital Sky Survey (SDSS) is a large-scale study of multispectral images and redshift spectra of stars and galaxies using the 2.5-meter wide-angle telescope at Apache Point Observatory in New Mexico. Scientists for this project have released a comprehensive analysis of the largest three-dimensional map of the universe ever created. New data fill the most significant gaps in our understanding of the history of the Universe — 11 billion years of its expansion and development.
A comprehensive analysis of the largest 3D map of the universe ever created was released as part of the Sloan Digital Sky Survey (SDSS), which includes scientists from Pennsylvania. The new results fill the most significant gaps in our study of the history of the Universe and come from the Extended Baryon Oscillation Spectroscopic Investigation (eBOSS), which is one of the component studies of the SDSS.
This description of the cosmic distribution of more than two million galaxies and quasars, covering almost the entire history of the Universe, is the result of many years of efforts by a large international team of scientists.
The new 3D map and its analysis not only expand our understanding of the history and structure of the universe. They also provide a framework that can foster new discoveries.
The observations were made at the Apache Point Observatory in New Mexico.
Scientists know quite well the ancient history of the universe and the recent history of its expansion, but there is a major gap in the middle of 11 billion years. For five years, researchers have been working to fill this gap.
Scientists know what the universe looked like in its infancy, thanks to thousands of scientists around the world who measured the relative abundance of elements created shortly after the Big Bang and who studied the cosmic microwave background. Researchers also know the history of its expansion over the past several billion years from galaxy maps and distance measurements, including from previous phases of the SDSS.
Taken together, the data — a detailed analysis of the eBOSS map and earlier SDSS experiments — now provide the most accurate measurements of expansion history over the widest range of space-time. These studies allow scientists to connect all the old and new dimensions into the complete history of the expansion of the universe.