The formation of the ice giants, Neptune and Uranus, has proven difficult to model precisely. Current models suggest that the matter density in the outer regions of the Solar System was too low to account for the formation of such large bodies from the traditionally accepted method of core accretion, and various hypotheses have been advanced to explain their formation. One is that the ice giants were not formed by core accretion but from instabilities within the original protoplanetary disc and later had their atmospheres blasted away by radiation from a nearby massive OB star. COUNT 3
QSN1 What could have blasted Neptune and Uranus's atmosphere with radiation, aiding in creation?  ANS1 nearby massive OB star QSN2 What is too low to account for the formation of Neptune? ANS2 matter density QSN3 If Neptune was formed from instabilities within the original protoplanetary disc, what was it not formed by? ANS3 core accretion