659K views · 15K reactions | An incredible cosmic blast! 勞 Astronomers believe this explosion, SN 2015F, was triggered by the collision of a white dwarf and a Sun-like star in the NGC 2442 galaxy. While the actual supernova lit up 80 million years ago, its light has only recently reached Earth, allowing us to witness this ancient event.  Credit: Changsu Choi & Myungshin Im (Seoul National University) | The Galactic Void | Facebook