Editing Astronomical radio source (section)

===Star forming regions===
Short [[radio waves]] are emitted from complex [[molecules]] in dense clouds of [[gas]] where [[star]]s are giving birth.

[[Spiral galaxy|Spiral galaxies]] contain clouds of [[neutral hydrogen]] and [[carbon monoxide]] which emit radio waves. The radio frequencies of these two molecules were used to map a large portion of the Milky Way galaxy.<ref>{{cite book|last=Gonzalez|first=Guillermo|author2=Wesley Richards|title=The Privileged Planet|publisher=[[Regnery Publishing]]|year=2004|isbn=0-89526-065-4|url=https://books.google.com/books?id=KFdu4CyQ1k0C|access-date=2008-04-02|page=382|archive-date=2021-04-27|archive-url=https://web.archive.org/web/20210427160442/https://books.google.com/books?id=KFdu4CyQ1k0C|url-status=live}}</ref>