Goodricke's law

Goodricke's law refers to a principle in astronomy that addresses the variability of certain types of stars, specifically those known as “pulsating variable stars,” like Cepheids. It states that the brightness of these stars changes in a predictable way over time, allowing astronomers to determine their distance from Earth. By observing the period between brightness changes, scientists can calculate the star’s intrinsic brightness and, using this information, estimate how far away it is. This law plays a crucial role in measuring distances in the universe, contributing to our understanding of cosmic scales.