* Apparent magnitude: If you mean the star that appears brightest to us on Earth, that's Sirius, also known as the Dog Star. It's located in the constellation Canis Major.
* Intrinsic brightness: If you mean the star that is actually the most luminous (emits the most light) in the universe, that's a bit trickier. There are many extremely luminous stars, but most are far away, making them appear dimmer to us. Some examples include:
* R136a1: A hypergiant star in the Tarantula Nebula, considered the most luminous star known.
* Eta Carinae: A massive star system that undergoes extreme outbursts, making it temporarily much brighter than the Sun.
It's important to remember that the brightness of a star as we see it from Earth is affected by both its actual luminosity and its distance from us.
