The Sloan Digital Sky Survey has observed over 100,000 white dwarfs, making it the largest catalog of white dwarfs.

The White Dwarf Catalog contains information about the physical properties of white dwarfs, such as their mass, radius, and temperature.

The Palomar Observatory Sky Survey contains information about the variability of white dwarfs, such as their pulsation periods and amplitudes.

The Two Micron All-Sky Survey contains information about the chemical composition of white dwarfs, such as their carbon and oxygen abundances.

The Sloan Digital Sky Survey is used to study the evolution of white dwarfs by observing their colors and luminosities.

The Sloan Digital Sky Survey contains information about the spatial distribution of white dwarfs by observing their positions on the sky.

The Palomar Observatory Sky Survey is used to study the binary white dwarf systems by observing their eclipses.

The Sloan Digital Sky Survey contains information about the magnetic fields of white dwarfs by observing their polarization.

The Sloan Digital Sky Survey is used to study the atmospheres of white dwarfs by observing their spectra.

The White Dwarf Catalog contains information about the masses of white dwarfs by observing their gravitational effects on their binary companions.

The Sloan Digital Sky Survey is used to study the radii of white dwarfs by observing their eclipses.

The Sloan Digital Sky Survey contains information about the temperatures of white dwarfs by observing their colors.

The Sloan Digital Sky Survey is used to study the luminosities of white dwarfs by observing their apparent magnitudes.

The Sloan Digital Sky Survey contains information about the distances to white dwarfs by observing their parallaxes.

The Sloan Digital Sky Survey is used to study the kinematics of white dwarfs by observing their radial velocities.