Since it’s launch in 1990, the Hubble Space Telescope has produced some of the most spectacular images of our universe. In 1995, the spirit of discovery led the Hubble team to point the telescope at the darkest patch of sky they could find, not knowing if they would see anything at all. In that patch of sky, the size of a pinhead at arms length, the Hubble Deep Field observation revealed 3,000 galaxies stretched out to distances of up to 13 billion lightyears. Since looking deep into space is also looking deep into the history of the universe (when the light left it's source), the observation was our first nearly complete view of the entire history of the universe in one image. Hubble’s observations narrowed our knowledge of the age of our universe to a decimal point of accuracy (from a range of 10-20 billion years down to 13.7 billion) and brought us that much closer to understanding where we sit in this vast and beautiful space-time.
More about the Hubble Deep Field observation: