Distant galaxies as seen in a deep sky survey in Ursa Major (also known as the Big Dipper).

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The picture was taken by pointing the Hubble to one of the emptiest parts of the sky, focused on a region of space the diameter of a sand grain held at arm's length.  The image reveals layer upon layer of galaxies (stars from our own galaxy appear as spiked points of light).  Light of the most distant one's took about 11 billion years to reach us.