Editing Neutrino (section)

=== Cosmic neutrinos ===
{{main|cosmic neutrino background|diffuse supernova neutrino background}}
As well as specific sources, a general background level of neutrinos is expected to pervade the universe, theorized to occur due to two main sources.

; Cosmic neutrino background (Big Bang-originated) :

Around 1&nbsp;second after the [[Big Bang]], neutrinos decoupled, giving rise to a background level of neutrinos known as the [[cosmic neutrino background]] (CNB).

; Diffuse supernova neutrino background (supernova-originated):

[[Raymond Davis, Jr.]] and [[Masatoshi Koshiba]] were jointly awarded the 2002 Nobel Prize in Physics. Both conducted pioneering work on [[solar neutrino]] detection, and Koshiba's work also resulted in the first real-time observation of neutrinos from the [[SN 1987A]] supernova in the nearby [[Large Magellanic Cloud]]. These efforts marked the beginning of [[neutrino astronomy]].<ref name=Pagliarl-Vissani-etal-2009>
{{cite journal
 |last1=Pagliaroli |first1=Giulia
 |last2=Vissani |first2=Francesco
 |last3=Costantini |first3=Maria Laura
 |last4=Ianni |first4=Aldo
 |year=2009
 |title=Improved analysis of SN1987A antineutrino events
 |journal=[[Astroparticle Physics (journal)|Astroparticle Physics]]
 |volume=31 |issue=3 |pages=163–176
 |arxiv=0810.0466 |doi=10.1016/j.astropartphys.2008.12.010
 |bibcode=2009APh....31..163P |s2cid=119089069 
}}
</ref>

[[SN 1987A]] represents the only verified detection of neutrinos from a supernova. However, many stars have exploded as supernovae in the universe, leaving a theorized [[diffuse supernova neutrino background]].