Glorious Sirius looks like one bright star but is actually a binary system (composed of 2 stars: Sirius A, the brighter & Sirius B, a faint white dwarf). It glitters like a silver-blue diamond! Binary stars are too close to be distinguished from one another when observed from Earth and are hence mistaken for one. The two stars that make up a binary typically orbit about a common center of mass. The brightest star, Sirius is easy to see in the spring and winter skies.