Astronomical survey

An astronomical survey is a general map or image of a region of the sky. Astrophotography can be used to make a picture (or images).

 Other kinds of astronomical surveys 
Another kind of astronomical survey can be made of some pictures, or spectra, or other observations of objects that share a common type or feature.   Astronomical surveys are often used to identify new objects and study large-scale structures in the universe.

Other information
Spectra can include measurements from X-ray astronomy.

Sources

Category:Astronomy