It all started back in 1996 when a group of astronomers pointed the Hubble Space Telescope at an empty patch in the sky in hopes of seeing something, anything. At the time, it was considered to be a risky move, given that demand for use of the telescope was so high.
After ten full days of exposing the telescope's CCD camera sensor to this seemingly vacuous patch of sky, a breathtaking image was produced. Over three thousand galaxies appeared in one image - some as dots, others as spirals. It was a visual reminder of just how big our universe really is. The photo is called the 'Hubble Deep Field.'
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