Sirius (moon)

Sirius, also known as the Dog Star, is the brightest star visible in Earth's night sky. Located in the constellation Canis Major, it appears luminous due to its intrinsic brightness and proximity to Earth—about 8.6 light-years away. Sirius is a binary system, consisting of a main-sequence star (Sirius A) and a smaller white dwarf companion (Sirius B). Its prominent glow has made it an important cultural and navigational point throughout history. Despite being called a moon, Sirius is a star, not a satellite of Earth, and it shines by converting hydrogen into energy through nuclear fusion.