Companion star could have triggered supernova
Extra blue light supports explanation for type 1a explosions
![supernova](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/03/032316_cc_supernova_free.jpg?fit=860%2C460&ssl=1)
PURPLE HAZE Supernova SN 2012cg (bright dot, center) exploded in a hazy galaxy (purple) 50 million light-years away. The explosion might have been triggered by a companion star, a new study reports.
Peter Challis/Harvard-Smithsonian CfA