What is the name of Hubble's 1995 image of distant galaxies?

Hubble’s 1995 image of distant galaxies was called the Hubble Deep Field. Astronomers selected a seemingly unremarkable patch of sky in the constellation Ursa Major and pointed Hubble at it for ten consecutive days between December 18 and 28, 1995. The final picture combined 342 separate exposures made through four filters.

The field covers only about 2.6 arcminutes on each side, an exceptionally tiny area of sky. Yet it revealed roughly 3,000 objects, almost all of them galaxies. Because light takes billions of years to cross the universe, many of those faint galaxies appear as they existed when the universe was much younger. The image became a landmark study of galaxy formation and evolution.

The name is often confused with later, deeper surveys. The Hubble Deep Field South followed in 1998, while the Hubble Ultra-Deep Field was made from longer observations and released in 2004. The eXtreme Deep Field, or XDF, went deeper still and was released in 2012. Those are related projects, but the original 1995 image is specifically the Hubble Deep Field.