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sloan digital sky survey sdss classic sdss org sdss4 org sdss3 org sdss data dr19 dr17 dr10 dr7 science press releases education image gallery legacy survey segue supernova survey collaboration publications contact us search home page of sdss org includes introduction to project and current events the sloan digital sky survey the sloan digital sky survey sdss is one of the most ambitious and influential surveys in the history of astronomy over eight years of operations sdss i 2000 2005 sdss ii 2005 2008 it obtained deep multi color images covering more than a quarter of the sky and created 3 dimensional maps containing more than 930 000 galaxies and more than 120 000 quasars sdss data have been released to the scientific community and the general public in annual increments with the final public data release from sdss ii occurring in october 2008 that release data release 7 is available through this website meanwhile sdss is continuing with the third sloan digital sky survey sdss iii a program of four new surveys using sdss facilities sdss iii began observations in july 2008 and released data release 8 in january 2011 data release 9 in august 2012 and data release 10 in july 2013 sdss iii will continue operating and releasing data through 2014 data release 10 contains the first release of apogee infrared galactic spectroscopy as well as cumulative updates to the boss optical extragalactic spectroscopy archive data release 9 contains the first release of boss spectroscopy to the public as well as several significant updates to the cumulative sdss archive data release 8 contains all images from the sdss telescope the largest color image of the sky ever made it also includes measurements for nearly 500 million stars and galaxies and spectra of nearly two million all the images measurements and spectra are available free online you can browse through sky images look up data for individual objects or search for objects anywhere in the sky based on any criteria the sdss used a dedicated 2 5 meter telescope at apache point observatory new mexico equipped with two powerful special purpose instruments the 120 megapixel camera imaged 1 5 square degrees of sky at a time about eight times the area of the full moon a pair of spectrographs fed by optical fibers measured spectra of and hence distances to more than 600 galaxies and quasars in a single observation a custom designed set of software pipelines kept pace with the enormous data flow from the telescope the two key technologies that enabled the sdss optical fibers and the digital imaging detectors known as ccds were the discoveries awarded the 2009 nobel prize in physics during its first phase of operations 2000 2005 the sdss imaged more than 8 000 square degrees of the sky in five optical bandpasses and it obtained spectra of galaxies and quasars selected from 5 700 square degrees of that imaging it also obtained repeated imaging roughly 30 scans of a 300 square degree stripe in the southern galactic cap with new financial support and an expanded collaboration including 25 institutions around the globe sdss ii carried out three distinct surveys the sloan legacy survey completed the original sdss imaging and spectroscopic goals the final dataset includes 230 million celestial objects detected in 8 400 square degrees of imaging and spectra of 930 000 galaxies 120 000 quasars and 225 000 stars segue the sloan extension for galactic understanding and exploration probed the structure and history of the milky way galaxy with new imaging of 3500 square degrees and spectra of 240 000 stars in a variety of categories in selected fields the sloan supernova survey carried out repeat imaging of the 300 square degree southern equatorial stripe to discover and measure supernovae and other variable objects in the course of three 3 month campaigns the supernova survey discovered nearly 500 spectroscopically confirmed type ia supernovae which are being used to determine the history of the accelerating cosmic expansion over the last 4 billion years sdss data have supported fundamental work across an extraordinary range of astronomical disciplines including the properties of galaxies the evolution of quasars the structure and stellar populations of the milky way the dwarf galaxy companions of the milky way and m31 asteroids and other small bodies in the solar system and the large scale structure and matter and energy contents of the universe this site includes for a brief overview of sdss science contributions a more in depth view can be found in the online materials from the 2008 symposium the sloan digital sky survey asteroids to cosmology funding for the sdss and sdss ii was provided by the alfred p sloan foundation the participating institutions the national science foundation the u s department of energy the national aeronautics and space administration the japanese monbukagakusho the max planck society and the higher education funding council for england the sdss was managed by the astrophysical research consortium for the participating institutions images of the sdss click for more information the final survey the whirlpool galaxy m51 sdss galaxy map the sdss field of streams sdss ii supernovae quasar spectra submit comments and questions to the sdss helpdesk last updated