The SDSS is primarily focused on studying the formation and evolution of galaxies by obtaining detailed images and spectroscopic data of millions of galaxies.

The Sloan Digital Sky Survey began in 2000 and has been ongoing since then.

The Sloan Digital Sky Survey uses the Apache Point Observatory Telescope, located in New Mexico, USA.

The Sloan Digital Sky Survey primarily covers the visible light wavelength range.

The Sloan Digital Sky Survey has observed millions of galaxies.

SDSS DR7 contains spectroscopic data for over 2 million galaxies.

BOSS (Baryon Oscillation Spectroscopic Survey) is the instrument used for spectroscopy in the Sloan Digital Sky Survey.

The main scientific goal of BOSS is to measure the expansion rate of the universe.

The SDSS Camera is the instrument used for imaging in the Sloan Digital Sky Survey.

The resolution of the Sloan Digital Sky Survey images is 0.2 arcseconds.

SDSS DR4 contains imaging data for over 100,000 square degrees of the sky.

The SDSS Data Pipeline is the software used to process the data from the Sloan Digital Sky Survey.

The data from the Sloan Digital Sky Survey is publicly available on the SDSS website.

Galaxy Zoo is the citizen science project that allows volunteers to help classify galaxies from the Sloan Digital Sky Survey.

SDSS Supernova Search is the citizen science project that allows volunteers to help search for supernovae in the Sloan Digital Sky Survey.