Galaxy surveys aim to create a comprehensive map of the distribution of galaxies in the universe, providing insights into their large-scale structure and clustering.

Imaging surveys capture images of galaxies across a wide area of the sky, allowing astronomers to study their morphology, size, and brightness.

Spectroscopic surveys obtain spectra of galaxies, which provide information about their chemical composition, element abundances, and gas content.

The Sloan Digital Sky Survey (SDSS) is a major galaxy survey that has collected detailed spectroscopic data for millions of galaxies, providing insights into their properties and evolution.

The Dark Energy Survey (DES) aims to study the properties of dark energy, a mysterious force believed to be responsible for the accelerated expansion of the universe.

The Cosmic Evolution Survey (COSMOS) is a deep and wide galaxy survey that aims to study the evolution of galaxies over cosmic time, from the early universe to the present day.

Photometric surveys measure the brightness of galaxies in different wavelengths, providing information about their stellar populations, colors, and luminosities.

The Wide-field Infrared Survey Explorer (WISE) discovered a large population of faint, low-surface-brightness galaxies that were previously missed by optical surveys.

The Baryon Oscillation Spectroscopic Survey (BOSS) aims to map the distribution of baryonic matter in the universe, providing insights into the large-scale structure and evolution of the cosmos.

The Dragonfly Telephoto Array (DTA) discovered a population of ultra-diffuse galaxies, which are extremely large and faint galaxies with very low surface brightness.

The Euclid mission aims to study the properties of dark energy and dark matter, providing insights into the fundamental nature of the universe.

The ATLAS3D Survey discovered a population of compact elliptical galaxies, which are extremely compact and massive galaxies with high stellar densities.

The MaNGA survey aims to measure the motion of galaxies, providing insights into their dynamics, kinematics, and interactions with neighboring galaxies.

The eBOSS Survey discovered a population of green valley galaxies, which are galaxies that lie in the transition region between the blue cloud and red sequence in color-magnitude diagrams.

The DESI survey aims to measure the distance to galaxies, providing insights into their redshift, luminosity, and the expansion history of the universe.