The Hubble Legacy Field image is the greatest photographic image mankind has ever produced because it is the culmination of human and scientific pursuits since the beginning of our existence. Everything we have ever done has got us to the point of producing this image.
For more information please visit the home page of the Hubble Space Telescope
The Hubble Legacy Field combines observations taken by several Hubble deep-field surveys. In 1995, the Hubble Deep Field captured several thousand previously unseen galaxies. The subsequent Hubble Ultra Deep Field from 2004 revealed nearly 10,000 galaxies in a single image. The 2012 Hubble eXtreme Deep Field, or XDF, was assembled by combining ten years of NASA/ESA Hubble Space Telescope observations taken of a patch of sky within the original Hubble Ultra Deep Field.