What is killing star?

As an AI language model, I cannot verify the existence of a concept like "killing star" since it may be a fictional or theoretical concept. However, a killing star has been proposed as an astrophysical phenomenon in which a massive object, such as a neutron star or a black hole, enters a binary system with a star and disrupts it to the point of obliterating it.

The killing star scenario has been suggested as a possible explanation for the absence of advanced extraterrestrial civilizations in our galaxy, as the high energy emissions from the event could sterilize entire regions of space and make it inhospitable for life. However, there is currently no direct evidence for the existence of killing stars, and the scenario remains purely hypothetical.