Sirius B is a white dwarf star and the faint companion to Sirius A, the brightest star in Earth's night sky (also known as the "Dog Star"), located in the constellation of Canis Major or the "Greater Dog".
It is a white dwarf, a remnant of an intermediate-mass star that has exhausted its fuel, and is the closest example to Earth. It is the secondary component of the Sirius binary system, of which the 'A' component is the brightest star in the night sky.
