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.
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