"Extragalactic
astronomy is the branch of astronomy
concerned with objects outside our own Milky Way
Galaxy. In other words, it is the study of all astronomical objects
which are not covered by galactic astronomy,
the next level of galactic astronomy.
As instrumentation has improved, more distant objects can now be
examined in detail. It is therefore useful to sub-divide this branch
into Near-Extragalactic Astronomy and Far-Extragalactic Astronomy.
The former deals with objects such as the galaxies
of our Local Group,
which are close enough to allow very detailed analyses of their
contents (e.g. supernova remnants,
stellar associations).
The latter describes the study of objects sufficiently far away that
only the brightest phenomena are observable.."
Source:
Wikipedia
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