For 10 points, identify this region beyond Uranus and Neptune from which long-term comets originate.
One theory of its formation proposed by Higuchi and Mukai invoke the Kozai mechanism's alternating increases of inclination of eccentricity. Another theory, that it formed from a large protostar nebula, was proposed by Safronov and Cameron and support for it includes the two peaks from a histogram plot of the aphelia of its long-period objects. First proposed by Ernest Opik, it is the place of origin of Hyakutake and Hale-Bopp. For 10 points, identify this region beyond Uranus and Neptune from which long-term comets originate.
One theory of its formation proposed by Higuchi and Mukai invoke the Kozai mechanism's alternating increases of inclination of eccentricity.
{Oort} Cloud