‘Zombie Stars’ Are Racing Throughout the Universe

Hundreds of thousands of years in the past, tens of hundreds of light-years away, two large white stars brushed in opposition to 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 most likely happen at a price of many hundreds of thousands per day.