Except that it's lots of lightyears away which means it would have been lots of years ago which means....OMG THEY'RE ON THEIR WAY HERE, RUN!
My first thought was Run? Where to? However it occurred to me that if we're observing them 1500 years ago we still maybe have plenty of time to find somewhere to hide. If they are travelling at 0.5 light speed they are still 750 years away, they are probably only coming around to borrow a cup of sugar in any case.
I'm not an physicist but it seems like building an object to trap the entirety of the energy escaping a star would significantly change the position of the Goldilocks zone.
Interesting point, could be a double whammy, you could build a partial sphere and then terraform Venus, getting lots of power and a new planet to fuck up at the same time.
I hope this isn't just some boring suicide and is actually some kind of insane Illuminati cover up shit.
You hope that bad shit that happens is worse than it first appears so that you can be entertained? That's pretty fucked up.
16.5 feet in the Twilight Zone = 1 Rod Serling