SkyServer makes the entire survey available, free of charge, to both researchers and SkyServer is the web site where you can get data from the Sloan Digital Sky Survey (SDSS).
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I want to mirror the SDSS archive - how can I get a copy of all the data?.Releases for objects that are common between them? Are DR8 objIDs different from DR7 and older.Why does SDSS use the long (64-bit) objID fields, and what is the composition of the PhotoObj.
Spectroscopic objects, and which one should I use? What is the difference between class and objType for.How do I change the precision of values in the output of my query?.Why do z and zErr (in SpecObj) have different.What is the difference between SpecPhoto.How do I get photometry for spectroscopic objects?.What are the differences between PhotoObj, PhotoTag, and PhotoObjAll?.What is the difference between Target and Best?.How do I convert from the SDSS's ugriz magnitudes to UBVRI magnitudes?.What is the Catalog Archive Server (CAS)?.What does the long SDSS ID number mean, and how do I work with it?.What is the difference between class and objType,.Why are some bright stars classified as galaxies?.
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