Editing Astronomy (section)

=== Gamma-ray astronomy ===
{{Main|Gamma ray astronomy}}
Gamma ray astronomy observes astronomical objects at the shortest wavelengths of the electromagnetic spectrum. Gamma rays may be observed directly by satellites such as the [[Compton Gamma Ray Observatory]] or by specialized telescopes called [[atmospheric Cherenkov telescope]]s.<ref name="cox2000"/> The Cherenkov telescopes do not detect the gamma rays directly but instead detect the flashes of visible light produced when gamma rays are absorbed by the Earth's atmosphere.<ref name="spectrum">{{cite web|url=http://www.pparc.ac.uk/frontiers/latest/feature.asp?article=14F1&style=feature|title=The electromagnetic spectrum|last=Penston|first=Margaret J.|date=14 August 2002|publisher=Particle Physics and Astronomy Research Council|archive-url=https://archive.today/20120908014227/http://www.pparc.ac.uk/frontiers/latest/feature.asp?article=14F1&style=feature|archive-date=8 September 2012|access-date=17 November 2016}}</ref>

Most [[Gamma ray|gamma-ray]] emitting sources are actually [[gamma-ray burst]]s, objects which only produce gamma radiation for a few milliseconds to thousands of seconds before fading away. Only 10% of gamma-ray sources are non-transient sources. These steady gamma-ray emitters include pulsars, [[neutron star]]s, and [[black hole]] candidates such as active galactic nuclei.<ref name="cox2000"/>