New research from The University of Texas at Austin adds evidence to a theory that claims the metallic cores of
rocky planets like Earth were formed when molten metal trapped
between grains of silicate rock percolated to the center of the planet during its early
formation.
We present the discovery of Kepler - 421b, a Uranus - sized exoplanet transiting a G9 / K0 dw... ▽ More In most theories of planet
formation, the snow - line represents a boundary
between the emergence of the interior
rocky planets and the exterior ice giants.