Extragalactic astronomy

Extragalactic astronomy

Extragalactic astronomy is the branch of astronomy concerned with objects outside our own Milky Way Galaxy (the study of all astronomical objects which are not covered by galactic astronomy). Extragalactic astronomy is that branch of astronomy which deals with the study of objects outside of Milky Way galaxy.

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.

Some topics include:

* Groups and clusters of galaxies
* Quasars
* Radio galaxies
* Supernovae

See also

* Galaxy color-magnitude diagram
* Galaxy formation and evolution
* Observational cosmology


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