A new study analyzing the motions of more than 50,000 stars has focused attention on one orange dwarf star known as HIP 85605 that has a chance of disrupting our solar system and sending a hail of killer comets our way. Such threats, known as Nemesis or Death Star scenarios, have been the stuff of science fiction and serious astronomical studies for decades. But the latest study has reignited interest because it targets a particular star during a particular time frame, between 240,000 and 470,000 years from now.