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The Hubble Deep Field uncovered thousands of distant galaxies

Focusing on a tiny patch of dark sky revealed deep cosmic history

In December 1995, astronomers pointed the Hubble Space Telescope at an apparently empty patch of sky for ten consecutive days. The resulting image revealed over 3,000 distant galaxies in various stages of evolution, demonstrating that the universe is uniformly crowded with galaxies across billions of light-years.

UGC 1810 and UGC 1813 in Arp 273 (captured by the Hubble Space Telescope) — NASA, ESA, and the Hubble Heritage Team (STScI/AURA) · Public domain · source

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NASA Science

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Tags: hubble, galaxies, deep field

The Hubble Deep Field uncovered thousands of distant galaxies: the short answers

Where does this come from, and can I check it?: Focusing on a tiny patch of dark sky revealed deep cosmic history. The figure is taken from NASA Science, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
Is this really a space fact?: Yes. It sits on the Space shelf, one of 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
What else can I read about it?: The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.