For 10 points, identify this law developed by a namesake American astronomer, which states that the redshift of light coming from any source is proportional to the distance of the source.
The Lundmark law is a quadratic form of this law, which was found to better fit empirical observations by I. E. Segal, and the Tully-Fisher relation can be used to estimate on of the quantities in its mathematical expression. Friedmann's equations can yield the constant of proportionality in this law, while recent recent observations of Cepheid variables estimate that constant to be between 65 and 80 kilometers per second-megaparsec. For 10 points, identify this law developed by a namesake American astronomer, which states that the redshift of light coming from any source is proportional to the distance of the source.
The Lundmark law is a quadratic form of this law, which was found to better fit empirical observations by I. E. Segal, and the Tully-Fisher relation can be used to estimate on of the quantities in its mathematical expression.
{Hubble's} Law (prompt on H-naught)