This video shows the small size of the Hubble eXtreme Deep Field in the night sky by comparing it to the size of the full Moon. Despite having less than one tenth of the width and 1% of the area of the Moon in the sky, the eXtreme Deep Field contains 5500 galaxies.
Note that the Moon does not actually pass near the Hubble eXtreme Deep Field.
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NASA, ESA, G. Bacon (STScI) and F. Summers (STScI)