The constellation of Leo contains the main sequence star, Regulus(Alpha Leonis), as well as Beta Leonis, Gamma Leonis, Delta Leonis, Zeta Leonis, Iota Leonis and Tau Leonis. Additional stars include Mu Leonis, Theta Leonis, red giant R Leonis, Wolf 359, Gliese 359, CW Leo, Caffau's Star. Leo also contains the Leo Ring, a group of large quasar groups and several galaxies including Messier 65, Messier 66, Messier 95, Messier 96, Messier 105 and NGC3628.