Merak vs Megrez

Merak, designated Beta Ursae Majoris, is a white main-sequence star of spectral type A1IV–V located approximately 79 light-years from the Sun in the constellation Ursa Major. It is one of the seven stars that form the Big Dipper asterism and, together with Dubhe (Alpha Ursae Majoris), serves as one of the two 'pointer stars' used to locate Polaris—the line drawn from Merak through Dubhe extends to...

Megrez, designated Delta Ursae Majoris, is an A-type main-sequence star approximately 81 light-years from Earth. With an apparent magnitude of 3.3, it is the faintest of the seven stars that form the Big Dipper asterism in the constellation Ursa Major. Megrez marks the junction point where the handle of the Dipper connects to its bowl, and its name derives from Arabic meaning the root of the tail....