Supernova

A supernova is a massive explosion . They are extremely bright and cause a burst of radiation that often for a short time outshines, an entire galaxy  before vanishing from view over several weeks or months. During this short period, a supernova can radiate  as much energy   as the Sun   could produce over its life span. Several types of supernovas can exist by being triggered in one of two ways, and it involves either turning off or suddenly turning on the production of energy through nuclear fusion . On average, supernovas come about once every 50 years in a galaxy, in the size of the Milky Way <span style="COLOR: black; FONT-FAMILY: 'Arial','sans-serif'; mso-ansi-language: EN"> and they play an important role in enriching the interstellar medium with heavy <span style="COLOR: black; FONT-FAMILY: 'Arial','sans-serif'; mso-ansi-language: EN; mso-bidi-font-family: 'Times New Roman'">elements  <span style="COLOR: black; FONT-FAMILY: 'Arial','sans-serif'; mso-ansi-language: EN">. Also another thing is the increasing shock waves from a supernova explosion, can activate the arrangement of new stars <span style="FONT-SIZE: 12.5pt; COLOR: black; FONT-FAMILY: 'Arial','sans-serif'; mso-ansi-language: EN">.
 * __Supernova__**