Sirius A

Sirius A is the brightest star visible in the night sky from Earth, part of the Sirius star system located about 8.6 light-years away. It’s a white main-sequence star, similar in type but larger and more luminous than our Sun. Sirius A has about twice the Sun's mass and 25 times its brightness, making it visible without a telescope. It works through nuclear fusion in its core, converting hydrogen into helium, which produces the energy that emits its intense light. It is part of a binary system with the faint white dwarf companion, Sirius B.