So there are apparently two 25,000 light year diameter gamma ray emitting bubbles extending above and below the plane of our galaxy. That wouldn't be so unusual because, hey, space is weird. However, they seem to only be a few million years old.
If some alien civilization is fucking around trying to improve their HyperTV reception and cause things to go black for the rest of us in the process, I'm going to be pissed off. However, if they were defending the galaxy against some giant galaxy-eating amoeblob, I'm willing to give them a pass.