Tyche is a planet hypothesized to exist in this region.
The existence of an object in this region was proposed to explain recurrent cycles of mass-extinction events. That proposed object is either a brown or red dwarf called Nemesis. Tyche is a planet hypothesized to exist in this region. The inner portion of this region is the disc-shaped Hills cloud. Halley-type short-period comets and all longperiod comets originate from this region, and the dwarf planet Sedna may have also originated in this region. Voyager 1 will probably reach this region in about three hundred years. For 10 points, name this outer boundary of our solar system, almost a light year away from the Sun and a thousand times farther away than the Kuiper Belt.
The existence of an object in this region was proposed to explain recurrent cycles of mass-extinction events.
Öpik-Oort cloud