About site: Astronomy/Cosmology - Sloan Digital Sky Survey

About site: http://www.sdss.org/

Title: Astronomy/Cosmology - Sloan Digital Sky Survey A dedicated 2.5 meter telescope which uses sensitive electronic light detectors to systematically map a quarter of the sky, building a catalog of celestial objects, galaxies, and quasars.

Supernova_Cosmology_Project This Berkeley labs site is based on observation of red shift in stars going supernova.

Tufts_Institute_of_Cosmology The Cosmology group at Tufts University with links to other cosmology sites

The_Big_Bang_(One_More_Time) A new model of the universe says it repeats itself in an endless cycle. Article from Christian Science Monitor. (May 9, 2002)

Turning_On_the_Universe Astronomers say the Universe's expansion has been accelerating recently. A new model for repulsive 'dark energy' may help explain the acceleration in a more natural way than other models. From Physica

Review_of_Mistake_of_Einstein Cosmologists have used recent data to constrain the type of 'dark energy' that may fill all of space. (July 30, 1999)

Coalition_for_Plasma_Science A group of institutions, organizations, and companies joining forces to increase awareness and understanding of plasma science and its many applications and benefits for society.

Alexa statistic for http://www.sdss.org/

Please visit: http://www.sdss.org/

Related sites for http://www.sdss.org/

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Sloan Digital Sky Survey

Home SDSS DataScience Press Releases Education Image GalleryLegacy SurveySEGUESupernova SurveyCollaboration 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 skyand created 3-dimensional maps containing more than 930,000 galaxiesand 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 scheduled for October 31, 2008. SDSS-III, a program of four new surveysusing SDSS facilities, began observations in July 2008, andwill continue through 2014.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.During its first phase of operations, 2000-2005, the SDSS imagedmore than 8,000 square degrees of the sky in five optical bandpasses,and it obtained spectra of galaxies and quasars selected from 5,700square 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 including25 institutions around the globe, SDSS-II carried out three distinctsurveys: 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 extraordinaryrange of astronomical disciplines, including the properties of galaxies,the evolution of quasars, the structure and stellar populationsof the Milky Way, the dwarf galaxy companions of the Milky Wayand 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 SymposiumThe 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 Whirlpool Galaxy (M51)

SDSS Galaxy Map

The SDSS Field of Streams

SDSS-II Supernovae

Quasar Spectra

The SDSS Telescope Send Web-related comments and questions tosdss-webmaster@sdss.org. Last updated 10/31/08

A	dedicated	2.5	meter
telescope	which	uses	sensitive	electronic
light	detectors	to	systematically	map
a	quarter	of	the	sky,
building	a	catalog	of	celestial
objects,	galaxies,	and	quasars.

http://www.sdss.org/

Sloan Digital Sky Survey 2008 December

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A dedicated 2.5 meter telescope which uses sensitive electronic light detectors to systematically map a quarter of the sky, building a catalog of celestial objects, galaxies, and quasars.

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