[Serious] Is the Past Real?

[Jehanne]

Supernova explosions are routinely observed in distant galaxies billions of light years away.  Were those stars real?

Again - it doesn’t matter.

Boru

Unless the burst (say, from a hypernova) sterilizes the Earth, or, a black hole is careening through space and passes through our Solar System. Many thousands of human beings will due from cancer this year, the sole result of a chance encounter with a cosmic ray that originated in a supernova that occurred long, long ago in a galaxy that was far, far away.