# mass-radius relation

The mass-radius relation is a relationship between the radius, *R*, of a main-sequence star and its mass, *M*. If *R* and *M* are both in solar
units, then *R* = *M* ^{0.8}.

A

*R*, of a main-sequence star and its mass, *M*. If *R* and *M* are both in solar
units, then *R* = *M* ^{0.8}.