Editing Astronomy (section)

=== X-ray astronomy ===
{{Main|X-ray astronomy}}
[[File:B30727.jpg|thumb|X-ray jet made from a supermassive black hole found by NASA's Chandra X-ray Observatory, made visible by light from the early Universe]]
X-ray astronomy uses [[X-radiation|X-ray wavelengths]]. Typically, X-ray radiation is produced by [[synchrotron emission]] (the result of electrons orbiting magnetic field lines), [[bremsstrahlung radiation|thermal emission from thin gases]] above 10<sup>7</sup> (10&nbsp;million) [[kelvin]]s, and [[blackbody radiation|thermal emission from thick gases]] above 10<sup>7</sup> Kelvin.<ref name="cox2000"/> Since X-rays are absorbed by the [[Earth's atmosphere]], all X-ray observations must be performed from [[high-altitude balloon]]s, [[rocket]]s, or [[X-ray astronomy satellite]]s. Notable [[Astrophysical X-ray source|X-ray sources]] include [[X-ray binaries]], [[pulsar]]s, [[supernova remnant]]s, [[elliptical galaxies]], [[clusters of galaxies]], and [[active galactic nuclei]].<ref name="cox2000"/>