Hundreds of thousands of years in the past, tens of hundreds of light-years away, two large white stars brushed towards one another.
Then they exploded.
That’s common. Star explosions—aka supernovas—happen each century or so in our galaxy, the Milky Approach. There are trillions of galaxies. Do the mathematics. Throughout the incalculable breadth of the universe, supernovas in all probability happen at a charge of many thousands and thousands per day.