10 years to take a picture of the universe

This is a compiled image of 10 years worth of NASA Hubble Space Telescope photographs. NASA call this the eXtreme Deep Field (XDF) which is a section of sky at the center of the original Hubble Ultra Deep Field (previous holder of the title 'deepest image of the universe') and contains 5,500 galaxies even within its smaller field of view. The faintest galaxies you can see on the picture are one ten-billionth the brightness of what the human eye can see. You can go into more detail and watch a video on the NASA website.

(Credit: NASA; ESA; G. Illingworth, D. Magee, and P. Oesch, University of California, Santa Cruz; R. Bouwens, Leiden University; and the HUDF09 Team)