But how such ice would be formed at the temperatures found in planetary interiors has remained mysterious. (sciencedaily.com)
Such pressures have been reached before, but only with shock waves that also create high temperatures — hundreds of thousands of degrees or more — that are not realistic for planetary interiors. (sciencedaily.com)
Zharkov, V. N. & Trubitsyn, V. P. Physics Of Planetary Interiors (Astronomy and Astrophysics Series, Pachart, 1978) (nature.com)