“There’s a name for that, you know,” I tell him, my heart so full it’s a wonder I can speak through it. “When two stars are drawn together. Their energy shared.” His head lolls my way. “Yeah? And what’s that?” I can picture the blast of light in my mind’s eye clearly. A collapse of two stars and an explosion so great it can be seen across the universe, causing ripples in the very fabric of space-time. Cataclysmic. Ruinous and miraculous. No words better describe what Ezra is to me. There’s a smile on my face when I answer my friend, the world around us dark. “Supernova.”
That twin star collision can make a supernova, but that's not the primary explanation given for a supernova. Just a single star can go supernova all by itself.