How small was the region of the sky targeted by the Hubble Ultra Deep Field (HUDF) relative to the total sky area?
Answer
one-thirteen-millionth of the total sky area
The physical area of the sky targeted by the Hubble Ultra Deep Field (HUDF) was exceptionally small, measuring only about one-thirteen-millionth of the total sky area. This minute fraction serves to emphasize the incredible concentration of galaxies discovered within that seemingly empty patch of space. To illustrate this, the text compares this field of view to looking at a postage stamp held at arm's length; that stamp would represent a larger percentage of an individual's total field of view than the HUDF represented of the entire celestial sphere.
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