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A Class 1A Supernova


When a star about as large as the sun travels with a companion star and becomes a white dwarf. It can suck out it's "conpanion's" energy and to the point that the white dwarf becomes unstable, then a super massive explosion known as a thermal nuclear runaway (also known as a type 1A supernova) happens.

Here is a link to a video related to this subject: http://v.youku.com/v_show/id_XMTU2Mzg3ODA=.html