Explaining The Universe on Instagram: "Sirius, also known as the Dog Star, is the brightest star in the night sky and is part of the constellation Canis Major, which means “Greater Dog.” It shines about 25 times brighter than the Sun and is located roughly 8.6 light-years away from Earth, making it one of our nearest stellar neighbors. What appears as a single bright star is actually a binary system—Sirius A, a hot, white main-sequence star, and Sirius B, a faint white dwarf that was once a mass