The Hubble Ultra-Deep Field (HUDF) is an image of a small region of space in the constellation Fornax, composited from Hubble Space Telescope data accumulated over a period from September 24, 2003, through January 16, 2004, and released in 2004. Covering 2.4 arcminutes to an edge, the area was selected because of the low density of bright stars in the near-field, allowing much better viewing of dimmer, more distant objects. It required 400 rotations and a million seconds (11.6 days) of exposure to obtain sufficient light for producing this image, which contains an estimated 10,000 galaxies.
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