Mass-radius curve of solar-composition substellar objects
= Mass-radius curve of solar-composition substellar objects
For a specified age and irradiation, a <hydrogen>–<helium> sequence rises at low mass, has radii near Jupiter's across giant planets and <brown dwarfs>, and declines as <electron degeneracy pressure> becomes important. Above the <hydrogen-burning minimum mass>, sustained fusion supports a rising low-mass stellar branch.