The term "Brightest Star" often refers to Sirius, the brightest star visible from Earth. Located in the constellation Canis Major, Sirius is about 8.6 light-years away and is part of a binary star system, which means it has a companion star. Its brightness is due to its intrinsic luminosity and proximity to our planet. Sirius has been significant in various cultures throughout history. In ancient Egypt, it was associated with the flooding of the Nile and the start of the new year. The star is also known as the "Dog Star" because of its position in the Canis Major constellation, which represents a dog in Greek mythology.