The universe's most extreme dead stars can form from vampire white dwarfs — and scientists finally know how

When stars the size of our sun die, they leave behind powerful stellar remnants called white dwarfs — and these white dwarfs can transform into even more extreme objects called neutron stars, composed of the densest material in the universe. However, scientists have found that conditions must be "just right" for the major makeover to occur. You can think of it like a cosmic "Goldilocks" situation.As it turns out, the white dwarf has to be feeding on a companion star like some kind of cosmi