Our sun's undiscovered stellar nemesis is still out there, says physicist

Long-period, high-inclination comets of the sort that can cause extinction-level impacts here on Earth have long been thought to originate from a theoretical Oort cloud. That is, a roughly spherical cloud of icy cometary objects that number in the trillions at distances that exte This story matters for Science & Discovery readers tracking science. Reported by phys.org. Read the full original at the source link below.