Hubble eXtreme Deep Field
The Hubble eXtreme Deep Field, or XDF, was assembled by combining 10 years of NASA Hubble Space Telescope photographs taken of a patch of sky at the center of the original 2004 Hubble Ultra Deep Field (HUDF). It includes very deep exposures in red light from Hubble’s recently installed infrared camera, the Wide Field Camera 3. These exposures enable new studies of the earliest galaxies in the universe. The XDF contains about 5,500 galaxies, even within its smaller field of view. Some are the faintest and most distant galaxies ever seen.