Both the distances and timespans involved here are difficult to grasp.
Norm, have you by chance seen one of the latest editions of the National Geographic Atlas of the World? They now include not only detailed topographical maps of the earth and all we know about the known planets, but also a three dimensional model of known space out to millions of light years away.
The distances involved here are so vast that the entire Universe could have blown up a million years ago, and the blast front won’t even reach us for another few million years, but when the light from the explosion finally reaches us it will be far too late to do anything about it....
I love perspective.