may have the same temperature as a main-sequence star, but a completely different luminosity. Based on the figure what other property can we use to further classify stars? Choose one: A. composition B. rotation rate C. color D. radius

To further classify stars that may have the same temperature but different luminosities, we can use the property of their radius. <br /><br />The correct choice is:<br /><br />D. radius<br /><br />The reason for this is that a star's luminosity depends on both its temperature and its radius. Two stars with the same temperature can have different luminosities if they have different radii. A larger star will generally be more luminous than a smaller star at the same temperature. This relationship is described by the Stefan-Boltzmann Law, which states that the luminosity of a star is proportional to the fourth power of its radius and the fourth power of its temperature.