«At over 1.4 million kilometers (869,919 miles) wide, the Sun contains 99.86 percent of the
mass of the entire solar system: well over a million
Earths could fit inside its
bulk.
(Within a typical atmosphere, as on
Earth, heat transport by conduction and molecular
mass diffusion are relatively insignificant for
bulk transport (there is some role in smaller - scale processes involving particles in the air), except when the net radiative flux and convective flux are very very small (not a condition generally found on
Earth).