Changes

==Type II==

==Type II==

[[Image:Sn94d_hiz_big.jpg|right|thumb|Supernova 1994D, visible as the bright star in the lower left, occurred in disk galaxy NGC 4526]]

[[Image:Sn94d_hiz_big.jpg|right|thumb|Supernova 1994D, visible as the bright star in the lower left, occurred in [[lenticular galaxy]] NGC 4526]]

A type II supernova is a violent stellar event involving a massive [[star]] of at least eight solar masses at the end of its life, when it's unable to maintain itself anymore through nuclear [[fusion]], causing a chain reaction that leads to the collapse of the star's core and subsequent explosion.<ref>Gilmore, G. (2004). ASTRONOMY: The Short Spectacular Life of a Superstar. ''Science'', 304(5679), pp.1915-1916. [http://science.sciencemag.org/content/304/5679/1915.summary Online]</ref>

A type II supernova is a violent stellar event involving a massive [[star]] of at least eight solar masses at the end of its life, when it's unable to maintain itself anymore through nuclear [[fusion]], causing a chain reaction that leads to the collapse of the star's core and subsequent explosion.<ref>Gilmore, G. (2004). ASTRONOMY: The Short Spectacular Life of a Superstar. ''Science'', 304(5679), pp.1915-1916. [http://science.sciencemag.org/content/304/5679/1915.summary Online]</ref>