Editing Cosmic noise (section)

{{Short description|Physical phenomenon from outside of the Earth's atmosphere}}
'''Cosmic noise''', also known as '''galactic radio noise''', is radio-frequency electromagnetic radiation from sources [[Outer space|outside of the Earth's atmosphere]]. Its characteristics are comparable to those of [[thermal noise]]. Cosmic noise occurs at frequencies above about 15&nbsp;[[Hertz|MHz]] when highly directional antennas are pointed toward the Sun or other regions of the sky, such as the [[Galactic Center|center of the Milky Way Galaxy]]. Celestial objects like [[quasar]]s, which are super dense objects far from Earth, emit electromagnetic waves in their full spectrum, including radio waves. The fall of a [[meteorite]] can also be heard through a radio receiver; the falling object burns from friction with the Earth's atmosphere, ionizing surrounding gases and producing [[radio waves]]. [[Cosmic microwave background radiation]] (CMBR) from [[outer space]] is also a form of cosmic noise. CMBR is thought to be a relic of the [[Big Bang]], and pervades the space almost homogeneously over the entire [[celestial sphere]]. The [[Bandwidth (signal processing)|bandwidth]] of the CMBR is wide, though the peak is in the microwave range.