[Errant]

One has to wonder if one day we trigger something picked up thousands of light-years away, in another galaxy, by some alien satellite as a massive gamma emission and then subsequent explosion.

At least maybe it will be quick. ;)

[MHGinTN]

The watchers don’t have to be so far away. It is a very good bet that humankind has been under scrutiny for generations, and particularly since our detonations in the forties, fifties and sixties. The detections may have been no further away than the Moon ... or in polar orbit (Black KNight anyone?).