The Sun, otherwise known as Sol. In at second, Sirius.
the blue giant is the brightest star
The brightest star as seen from Earth is the sun. The brightest star in the night sky is Sirius.
It is a descriptive adjective. Such as in this sentence: That star is the brightest star I have ever seen.
The least brightest star has not yet been seen and so not identified.
Sirius is the brightest star and can be seen from the UK. Link: http://en.wikipedia.org/wiki/Sirius ----
The brightest star in the sky is Sirius. The brightest object that looks like a star is the planet Venus - which is brighter than any star. You can see it these days (Aug. 2010) after sunset in the west, as a very bright star.
The Rigel star is a star in the Orion constellation. Rigel is the brightest star in the Orion constellation, and it is the seventh brightest star seen in the night's sky.
the moon.
Its possible to see Sirus. Its the brightest star you can in the Sky.
The brightest star would be the Sun. See related question.
The sun is a star
The star Sirius is the brightest star visible from the earth. Sirius is in the Canis Major constelation, and is therefore often refered to as "the Dog Star"