'The Hubble Ultra Deep Field is the deepest image ever assembled by humanity.'
The image, a million-second-long exposure taken by the Hubble Space Telescope, displays about 10,000 galaxies (some of them among the first galaxies to follow from the Big Bang) and looks back about 13 billion years. Despite all that, the image covers only 11 square arcminutes -- about the size of a lowercase letter O in this sentence, and one thirteen-millionth of the entire sky.