It seems like a variant of the Nemesis theory: https://en.wikipedia.org/wiki/Nemesis_%28hypothetical_star%29 https://en.wikipedia.org/wiki/Nemesis_%28hypothetic

It seems like a variant of the Nemesis theory: https://en.wikipedia.org/wiki/Nemesis_%28hypothetical_star%29 https://en.wikipedia.org/wiki/Nemesis_%28hypothetical_star%2... which according to Adrain Mellott and Richard Bambach the regularity of the mass extinctions cannot be due to a dark star or brown dwarf or other large mass as it's orbit would have been perturbed by close encounters with other stars long ago. https://www.technologyreview.com/s/419809/the-death-of-nemesis-the-suns-distant-dark-companion/ https://www.technologyreview.com/s/419809/the-death-of-nemes...