Extragalactic astronomy

Deep space image from the Hubble Space Telescope

Extragalactic astronomy is astronomy about objects outside our Milky Way galaxy. It is the study of everything that is not covered in galactic astronomy: the study of objects in our galaxy.

Because of improvements in technology, we can see distant objects in more detail. Two versions of extragalactic astronomy are: near-extragalactic astronomy (the study of galaxies in our Local Group) and far-extragalactic astronomy (the study of objects outside our Local Group).

Pages on extragalactic astronomy include:

• Galaxy group
• Galaxy cluster
• Supercluster
• Quasars
• Supernovae
• Observable universe