The Deepest Photo Ever Taken:

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“Astronomers using the Hubble Space Telescope’s powerful new Advanced Camera for Surveys (ACS) have taken the deepest visible-light image ever made of the sky.

The 3.5-day (84-hour) exposure captures stars as faint as 31st magnitude, according to Tom M. Brown (Space Telescope Science Institute), who headed the eight-person team that took the picture. This is a little more than 1 magnitude (2.5 times) fainter than the epochal Hubble Deep Fields, which were made with the Hubble’s Wide Field and Planetary Camera 2. It is 6 billion times fainter than what can be seen with the naked eye.” Sky and Telescope