We live in a dangerous universe. We know about meteor and comets, about harmful radiation that could extinguish life without an electromagnetic shield, about major changes in climate that are both natural and man-made. There’s another risk out there that some scientists assert could cause large-scale extinctions even though it would occur scores of light-years …
Supernovae Give, And Can Take Away
We live in a dangerous universe. We know about meteor and comets, about harmful radiation that could extinguish life without an electromagnetic shield, about major changes in climate that are both natural and man-made. There’s another risk out there that some scientists assert could cause large-scale extinctions even though it would occur scores of light-years …
Many Worlds 