If you mean the star that appears brightest from Earth:
* Sirius is the brightest star in the night sky as seen from Earth. It's a binary star system located in the constellation Canis Major.
If you mean the star that emits the most light overall:
* Rigel in the constellation Orion is considered the most intrinsically luminous star visible to the naked eye. However, there are many stars in the universe that are much brighter than Rigel, but they are too far away to be seen easily.
Important Note: The brightness of a star as seen from Earth depends on two factors:
* Intrinsic Luminosity: How much light the star actually emits.
* Distance: How far away the star is from Earth.
Even though Rigel is the most luminous star visible to the naked eye, Sirius appears brighter because it is much closer to Earth.
