Cepheids: have regular patterns of dimness and brightness are only found in distant galaxies and solar systems can be used to calculate the orbits of planets were discovered using Bode's law

The correct answer for the statement that is being presented is this one: "have regular patterns of dimness and brightness." Cepheids: have regular patterns of dimness and brightness. It is a type of star that pulsates radially, varying in both temperature and diameter to produce brightness changes with a well-defined stable period and amplitude.