«This transition corresponds to a boundary between the layers that we can image with seismology and that we attribute to changes in rock composition.» (sciencedaily.com)
Team members lean toward a solid nickel - iron rock composition for the hot planet, possibly with a thick atmosphere. (sciencemag.org)
For certain rock compositions, it is possible to generate large volumes of molten rock under cooler conditions. (sciencedaily.com)