

There was an astrophysicist on the reddit thread who said this is definitely a hyperdense object orbiting a star very close, like with a 12 day orbital period. A neutron star or even a stellar mass black hole. He said one of the most interesting possibilities is that it’s a magnetar.
I’ve read exactly one time travel story where that was taken into account. They were trying to communicate with the past using tachyon beams, and they had to beam them into space aimed at where Earth WAS at the time they were trying to communicate with it.