(small region of the southern sky explored with HST)
The Hubble Deep Field South (HDF-S)
is a set of images of a small region of the southern sky
taken over a very long exposure by the Hubble Space Telescope,
with the aim of imaging the most distant galaxies possible.
The term is also used for its survey field, which is within the
constellation Ursa Major.
The goal of the effort was to provide
a resource analogous to the Hubble Deep Field (HDF), but within the
southern hemisphere, i.e., providing objects
for study (a number of the most advanced observatories are in
the southern hemisphere).